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问题
单项选择题
下列属于黄曲霉毒素中G族的是（）
A.黄曲霉毒素M
B.黄曲霉毒素B1
C.黄曲霉毒素G2
D.黄曲霉毒素B2
答案
参考答案：C
选择题
— We've spent too much money recently.
— Well, it isn't surprising. Our friend and relatives _____ around all the time.
A. are coming
B. had come
C. were coming
D. have been coming
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问答题 简答题
写出真空皮带机的启动步骤？
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