Point five: look at the repayment risk. Reimbursement risk fee, is that when investors corresponding borrower overdue list creditor's rights or bad debts, so risk fee reimbursement amount of account can be used to repay the principal and interest first, this will let next fall risk level, safety coefficient is relatively high, so it is more important, investors when the choice must be made sure. George Goncalves, head of us interest rate strategy at nomura, argues that this could be the start of a bigger sell-off, largely depending on whether the us tax reform will eventually be approved. The bond market has been sceptical about the prospect of approval. Republicans impact of tax legislation through congress may be particularly dangerous, for millions of middle-class and low-income families not only didn't get any good, but with the passage of time gradually cancel the income tax cuts. In addition, the republican plan would repeal Obama's personal mandate. According to the nonpartisan budget office, this would result in 13 million people losing their health insurance, with premiums rising 10 percent over the next decade. Not surprisingly, a recent Quinnipiac poll found only 29 percent of americans support the republican plan. The car engine is in the design phase, and the fuel used for the compression ratio is set. The compression ratio is a very important structural parameter of the engine, which indicates the volume of the gas at the beginning of the piston at the beginning of compression and the volume ratio of the gas volume at the end of the piston. In terms of power and economy, compression ratio should be bigger and better. The compression ratio is high, the power is good, the heat efficiency is high, the vehicle acceleration, the top speed of the car will be improved accordingly. However, the compression ratio of the gasoline engine is not too large due to the performance of the cylinder material and the vibration of gasoline combustion. In short, a high compression ratio USES a high grade fuel oil. The higher the fuel mark, the slower the oil will burn, and the lower the combustion detonation, the higher the compression ratio of the engine. On the contrary, the low-grade fuel combustion rate is faster, the combustion explosion is large, the engine compression is lower. Japan's industrial standard, JISK 0101, defines a car as a vehicle equipped with an engine and a control device that can still drive on land without a fixed orbit or overhead line.