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问题
判断题
碳素钢的碳含量越高,则其淬火加热温度也较高。( )
答案
参考答案:
错
选择题
看图选择。
1. The pen is in the pencil case.
A.
B.
C.
2. The boy is under the desk.
A.
B.
C.
3. Twenty minus three is _________.
A. 17
B. 16
C. 18
4.
+
= _________.
A. thirteen
B. fifteen
C. nineteen
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单项选择题
1/4,1/16,1/36,1/64,1/100,( )
A.1/121
B.1/81
C.1/169
D.1/144
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