单项选择题

下列不是发动机动力不足原因的是
A、进气不足
B、进油不足
C、混合气泄露
D、冷却液变质

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单项选择题

The following statements are factors leading to success EXCEPT ( ).    A.
There is no magic; It's practice, practice, practice.    B.
To be successful, put your nose down in something and get good at it.    C.
Push yourself. D.
It was a privilege to serve as a doctor.

单项选择题

外径千分尺的读数方法是( )。 A.
先读小数、再读整数,把两次读数相减,就是被测尺寸 B.
先读整数、再读小数,把两次读数相加,就是被测尺寸 C.
读出小数,就可以知道被测尺寸 D.
读出整数,就可以知道被测尺寸