以下哪种情况属不诚实劳动？（）
A.出工不出力
B.炒股票
C.制造假冒伪劣产品
D.盗版
参考答案：A, C, D
His MP5 is very useful, _______?[ ]
A. isn't it
B. is it
C. does it
D. doesn't it
密封圈、垫及法兰盘根垫制作时应注意哪些问题？
