如图所示标线的含义是什么()
A.禁止路边长时停放车辆
B.禁止路边临时停放车辆
C.禁止路边长时或临时停放车辆
D.路边可以长时或临时停放车辆
参考答案:A
目前已在南极建立科学考察实验站的国家达到了( )
A.15个
B.18个
C.20个
D.30个
It has been announced that candidates _____ remain in their seats until all the papers have been collected.
A.can
B.will
C.may
D.shall