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问题
单项选择题
气焊与气割的火焰温度高达()。
A.2000℃以下
B.3000℃以上
C.1000℃以上
答案
参考答案:
B
选择题
This is one of the best films _____.
A. that have been shown this year
B. that have shown
C. that has been shown this year
D. that you talked
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问答题 简答题
鱼类的毒腺为何不是多细胞腺?
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