"子痫"的发生，与哪些脏腑关系密切
A．妊娠腹痛B．异位妊娠C．胎动不安D．胎漏E．小产
参考答案：C
影像交换系统用户口令应当具有一定的复杂性，至少（）更换一次。
A.每周
B.每月
C.每季度
D.每半年
_______ of fans have voted online ________ their favourite singers.
A．Thousand, for
B．Thousand, to
C．Thousands, to
D．Thousands, for
