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问题
单项选择题
机车柴油机用柴油都是（）。
A、轻柴油
B、重柴油
C、高热值柴油
D、混合柴油
答案
参考答案：A
选择题
— Who should be responsible for the accident?
— The boss, not the workers. They just carried out the order _____.
A. as told
B. as are told
C. as telling
D. as they told
查看答案
判断题
使用定滑轮起吊重物可省力1/2。
查看答案
