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【单选题】
关于月经的临床表现,下列哪项是正确的A.
月经周期从月经干净的第一天算起
B.
经血一般不凝，是由于缺乏凝血因子
C.
一次月经出血量约为20～60ml
D.
正常月经周期是28～30天加减7天
E.
月经初潮早晚主要是由于营养和体重的关系
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举一反三
【单选题】I learned a little Russian _____ I was at middle school.
A.
though
B.
although
C.
as if
D.
when
【多选题】工件以下母线、圆柱轴线、上母线标注三种工序尺寸的定位误差，在同样精度的V形块上定位，工序基准不同，定位误差不等，即工序基准是圆柱下母线标注的产生的定位误差值_____，以圆柱轴线标注的产生的定位误差值位居______，以上母线标注的加工尺寸的定位误差为_____。因此，控制轴类零件键槽深度的尺寸，一般多由_______注起。
A.
最小
B.
第二
C.
最大
D.
下母线
【单选题】The Russian crisis of 1998
A.
occurred because of the inability of the Russian Government to lower the taxes.
B.
ended when President Yeltsin announced there will be no devaluation.
C.
was a culmination of continuing deterioration of economic conditions.
D.
was a result of a sharp price increase of Russian export commodities.
【单选题】I learned a little Russian _____ I was at middle school. [ ]
A.
though
B.
although
C.
if
D.
when
【单选题】We were told that ______ when Marx was already _______, he started to learn Russian.
A.
in 1840’s; in his fifties
B.
in the 1840’s; his fifties
C.
in the 1840’s; in his fifties
D.
the 1840’s; in his fifties
【判断题】U CC 是放大电路的直流电源,一方面与R B ,R C 相配合,使晶体管的发射结正偏、集电结反偏,以满足晶体管放大的外部条件;另一方面为输出信号提供能量。 U CC 的数值一般为几~十几伏。
A.
正确
B.
错误
相关题目：
【单选题】I learned a little Russian _____ I was at middle school.
A.
though
B.
although
C.
as if
D.
when