下列属于关节基本构造的结构是()。
A.关节唇
B.关节盘
C.关节面
D.关节结节
E.滑液囊
参考答案:C
Google's complaints about hacker attacks on its servers (服务器) made the public more concerned about
the problem of Internet safety. ____, it called for changes in recent Chinese laws. [ ]
A. However
B. Otherwise
C. Therefore
D. Though
遇带电电气设备着火时,应使用()进行灭火。
A、泡沫灭火器
B、砂子
C、干式灭火器