题目内容

流量控制阀分节流阀和两种。

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液压传动系统中的速度控制回路包括、快速运动回路和速度换接回路等。

Researches have _________ to the conclusion that your personality is affected by your genes.

A. come
B. got
C. reached
D. arrived

She kept practicing _________ she could win the National Speaking Competition.

A. to
B. in order to
C. so that
D. because of

Carl was not very good at mountain climbing as he's afraid of ________.

A. highs
B. heights
C. highness
D. hightening