SF3102A型电动轮制动踏板自由行程过大会造成（）。
A. 工作制动反应慢
B. 制动缓解慢
C. 甩尾
D. 刹车跑偏
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自主、自决、自控等是教师道德行为选择的规定性。
A. 正确
B. 错误
通常经济基本面较差（增长慢而物价高）时，债券投资收益较高。
A. 正确
B. 错误
In slow speed two-stroke engines,（）the fresh air entering begins when and stops as（）
A. the inlet port is opened by the up coming piston； the port is closed by the down going
B. the inlet valve is opened by the down going piston；the inlet valve is closed
C. the inlet port is opened by the down going piston；the port is closed by the up coming
D. the inlet valve is opened
The area of strong westerly winds occurring between 40°S and 60°S latitude is called the（）.
A. polar easterlies
B. prevailing westerlies
C. roaring forties
D. jet stream
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