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【单选题】
当直线段AB垂直于投影面时,它在该投影面上的投影ab重合为一点。这种性质叫( )。A.
收缩性
B.
放大性
C.
真实性
D.
积聚性
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反馈参考答案：
举一反三
【单选题】'Spare the rod and spoil the child'means_____.
A.
spoiling children is not as evil as it seems
B.
eliminating physical punishment is a sound policy
C.
if you do not inflict physical punishment,you will spoil your child
D.
spoiling childrenis a matter of definition
【简答题】You will spoil it if you ______ ( not be ) careful.
【单选题】The glass will______if you pour boiling water into it.
A.
split
B.
crash
C.
crack
D.
spoil
【单选题】You will spoil your child if you ______ it too much.
A.
treat
B.
pet
C.
strike
D.
help
【简答题】垂直轴
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