出现临床症状时,血小板的数量一般低于()
A.200×109/L
B.70×109/L
C.120×109/L
D.150×109/L
E.170×109/L
参考答案:B
_______is certain ______ the Normans conquered England in 1066 and then English changed.
A.That; that
B.It; what
C.That; what
D.It; that
人体由表面电极所记录的感觉活动电位的波幅()
A.2~10μv
B.10~60μv
C.60~100μv
D.100~150μv
E.150~200μv