进出口化妆品划分为肤用化妆品、发用化妆品、美甲化妆品、香水类、口腔卫生用品、特殊功能化妆品六大类。( )
参考答案:错
-When did you join the army(军队)?
-Last year. I __________ the army since I finished high school.[ ]
A. was
B. joined
C. have joined
D. have been in
叙述阀门盘根的更换方法。