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【单选题】
钎焊是一种古老的金属（）的工艺。A.
连接
B.
焊接
C.
加工
D.
永久连接
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举一反三
【单选题】测定中出现下列情况,属于随机误差的是:
A.
滴定时所用的试剂含有微量的被测组分
B.
读取滴定管读书时总是偏高或者偏低
C.
滴定管读数最后一位估计不准
D.
滴定时有少量的溶液溅出
【单选题】测定中出现下列情况,属于随机误差的是:
A.
滴定时所用试剂中含有微量被测组分
B.
读取滴定管读数时总是偏高过偏低
C.
滴定管读数后一位估计不准
D.
滴定时有少量溶液溅出
【单选题】.---Well, where did you spend your night that day ---At________Grand Hotel.
A.
where it is called Grand Hotel.
B.
what is called Grand Hotel.
C.
which is called Grand Hotel.
D.
that it is called Grand Hotel.
【单选题】Grand Canyon How was the Grand Canyon formed? The truth is that no one knows for sure though there are some pretty good guesses, and it is usually thought that a number of processes combined to create...
A.
decrease
B.
abstraction
C.
disparity
D.
corrosion
【单选题】分析测定中出现的下列情况,何种属于随机误差:
A.
滴定时加试剂中含有微量的被测物质，
B.
某分析人员几次读取同一滴定管的读数不能取得一致；
C.
某分析人员读取滴定管读数总是偏高或偏低；
D.
甲乙两人用同一方法测定，但结果总相差较大；
E.
滴定时发现有少量的溶液溅出
【单选题】测定中出现下列情况，属于随机误差的是（）。
A.
测定时有少量溶液溅出
B.
过滤时出现透滤现象
C.
滴定时所用试剂中有微量被测组分
D.
读取滴定管读数时，最后一位估计不准
【单选题】分析测定中出现的下列情况，何种属于随机误差
A.
某学生几次读取同一滴定管的读数不能取得一致
B.
某学生读取滴定管读数时总是偏高或偏低
C.
甲乙学生用同样的方法测定，但结果总不能一致
D.
滴定时发现有少量溶液溅出
【单选题】In view of lacking preparations for the competition and not wanting to lose face, Johnson eventua
A.
23．In view of lacking preparations for the competition and not wanting to lose face, Johnson eventually decided to _____． A．drop in
B.
drop off
C.
drop back
D.
drop out
【单选题】The Grand Canyon 大峡谷 The Grand Canyon, exceptionally deep, steep-walled canyon in northwestern Arizona, is excavated by the Colorado River. The Grand Canyon is 446 km long, up to 29 km wide, and more ...
B.
The Grand Canyon National Park covers a part of the canyon and plateau areas on both sides of it.
C.
The most impressive part of the canyon is just beside the Grand Canyon National Park.
D.
The Grand Canyon National Park contains towering buttes, mesas and the whole valleys.
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