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【单选题】
服务质量规范规定列车编组()辆以上时,售货(饭)车总数不超过4辆。A.
A:14辆
B.
AB:15辆
C.
C:16辆;
D.
D:18辆;
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【单选题】--Why has he been staying at home these days? --He ___________ since a month ago.
A.
has been out of work
B.
was out of work
C.
has lost his work
D.
had left from his work
【简答题】真值表是指表明逻辑门电路 和 逻辑对应关系的表格。
【简答题】真值表 是指 表明逻辑门电路 状态和 状态逻辑对应关系的表。
【简答题】苯巴比妥钠中重金属的检查方法如下:取本品适量,加水32ml,溶解后缓缓加稀盐酸溶液8ml,充分振摇,滤过,取滤液20ml,加酚酞指示剂1滴与氨试液适量至溶液恰显粉红色,加醋酸盐缓冲液2ml与水适量使成25ml,依法检查,含重金属不得过百万分之十。若标准铅溶液(每1ml相当于10μg的Pb)为1ml,计算供试品取样量。
【单选题】—Why has he been so upset? —He didn’t leave the things _____ they belonged, for _____ he was scolded by his parents.
A.
which; that
B.
which; this
C.
where; whose
D.
where; which
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