LM型车轮轮缘标准高度()。
A、25m
B、27mm
C、30mm
D、40mm
参考答案:B
把7.4的小数点向左移动两位是0.74.______.(判断对错)
After the quarrel, I tried all my best to fix the misunderstanding between us, but all my efforts seemed .
A.in vain
B.in case
C.in time
D.in trouble