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【判断题】
液压传动是用液体作为工作介质，依靠运动液体的压力能来传递动力。液压传动和气压传动称为流体传动。A.
正确
B.
错误
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【单选题】The 6-year-old child is old enough_______ himself.
A.
to dress
B.
to wear
C.
dresses
D.
wears
【单选题】Under no circumstances ______ be left alone at home.
A.
a three-year-old child should
B.
should a three-year-old child
C.
a three-year-old child should not
D.
should a three-year-old child not
【简答题】Martin is a fif-year-old boy. He used to be a “problem child”, but a recent communication with his mother changed his life. In the past, He didn’t give his mother many problems. , after his father...
【简答题】It is difficult for a two-year-old child (read) _____ this book.
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