题干
You should keep in mind ________ you should behave while travelling abroad.
A：that
B：what
C：how
D：where
答案(点此获取答案解析）
C
You should keep in mind ________ you should behave while travelling abroad.
A：that
B：what
C：how
D：where
匀速转动，下列关于小球受力的说法中正确的是： 