问题
单项选择题
蒸汽吊车在运转中，轴瓦的温度一般不应超过（）℃。
A.50
B.70
C.80
D.100
答案
参考答案：B
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蒸汽吊车在运转中，轴瓦的温度一般不应超过（）℃。
A.50
B.70
C.80
D.100
参考答案：B
| 用方框中所给单词的适当形式填空.每词限用一次. | |
2. It's the _____________ season in China because of Spring Festival. 3. Ask him if he wants to write something about staying ______________. 4. In fact, even the simplest everyday activities can make a real ___________to the environment. 5. You are not _______________to touch the exhibits. |