对Dane颗粒的叙述,正确的是( )
A.只含有表面抗原 B.只含有c抗原C.是完整的乙型肝炎病毒 D.是小球形颗粒
参考答案:C
Lack food supplies and wanted by the police, the terrorists made a ______ attempt to hijack(劫持) a plane to Iran.
A.brave
B.fresh
C.harmful
D.desperate
多极泵和深井泵就是水泵的()运行。