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【单选题】
()的投影特性是：(1)正面投影反映。(2)水平投影积聚成直线，且平行于OX轴。(3)侧面投影积影成直线，且平行于OZ轴。A.
铅垂面
B.
正平面
C.
水平面
D.
侧垂面
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【单选题】He worked very hard. _____ he got good grades in the final examination last year. [ ]
A.
In this way
B.
On the way
C.
By the way
D.
All the way
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【单选题】The reason why he succeeded is ______ he worked very hard.
A.
why
B.
that
C.
whether
D.
how
【单选题】He worked very hard, otherwise he the entrance exam.
A.
didn't pass
B.
couldn't pass
C.
hadn't passed
D.
couldn't have passed
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