题目内容

点火提前角是指跳火时刻到该缸运行至压缩上止点时对应的曲轴转角

A. 对
B. 错

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They are_____their clothes.

A. making
B. putting
C. put away
D. putting on

Listen! She____in the classroom.

A. is singing
B. sing
C. to sing
D. is sing

_____are the birds doing? They are singing in a tree.

A. Who
B. What
C. How
D. Where

Look,They are swimming in the river.I want_____you.

A. to go with
B. go with
C. helping
D. help

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