促进剂M
参考答案:硫醇基苯并噻唑。
This is my workmate ,Mr. zhou , but he ________ in New York for 10 years.
A.has worked
B.worked
C.is working
D.had worked
不准用钳子当()敲击物体。
A.扳手
B.锤子
C.一字旋具
D.凿子