There are two foreign students in the group and ____ (both/all) of them come from Canada.
下面标点符号中引号用法解释正确的一项是( )
骑在人民头上:“呵,我多伟大!”
把名字刻入石头,想“不朽”。
He has _____ my dictionary for two days.
将电阻为R1=3Ω的导体与电阻为R2的导体串联后总电阻为9Ω,则R1与R2并联后总电阻是