热轧H型钢的规格标记为H482×300×11×15，11代表H型钢的( )。
A. 高度为11mm
B. 宽度为11mm
C. 腹板厚度为11mm
D. 翼缘厚度为11mm
查看答案
含碳量小于2％的铁碳合金称作钢，含碳量大于2％时称作铁
A. 对
B. 错
—why didn’t Tom come to school?—He _____ and hurt his leg.
A. fell down
B. fell off
C. falls down
D. fells off
Lily _____ a lie yesterday. She wasn’t hurt at all.
A. told
B. tell
C. tells
D. say
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