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【简答题】
施工中常见的引起安全事故的因素有哪些?
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【简答题】实验课上,某小组的同学用生石灰进行“化学反应中能量的变化”实验时发现:向块状生石灰中加入适量水后没有明显的温度变化.为确定其原因,进行了如下实验探究. 【提出问题】生石灰是否变质?其成分是什么? 【查阅资料】氢氧化钙溶解过程中无明显温度变化,与盐酸反应无气体生成. 【猜想与假设】同学们认为生石灰样品已经变质,并对其成分作出了如下4种猜想. 猜想1:氧化钙和氢氧化钙; 猜想2:氧化钙和碳酸钙; 猜想...
【单选题】When he walked __________ my desk, he knocked my books __________ the floor.
A.
passed; onto
B.
past; onto
C.
passed; into
D.
past; into
【单选题】With my hand-held Reader, I’ve read more books in the past six months than I ________ in the past six years.
A.
doing
B.
did
C.
have
D.
do
【单选题】No one has come up with a better explanation of why dinosaurs ______.A.died awayB.died forC.died
A.
37. No one has come up with a better explanation of why dinosaurs ______. A.died away
B.
died for
C.
died of
D.
died out
【单选题】--- Yesterday Tommy walked past my table and ______ my bowls and dishes. --- He should be careful next time.
A.
knocked off
B.
took off
C.
showed off
D.
turned off
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【单选题】关于盈亏平衡点,下列说法正确的是
A.
盈亏平衡点上项目是盈利的
B.
盈亏平衡点上项目是亏损的
C.
盈亏平衡点上利润总额大于0
D.
盈亏平衡点上利润总额为0
【单选题】下图是甲、乙两人l0次射击成绩(环数)的条形统计图.则下列说法正确的是
A.
甲比乙的成绩稔定
B.
乙比甲的成绩稳定
C.
甲、乙两人的成绩一样稳定
D.
无法确定谁的成绩更稳定
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【单选题】下列符合口服补液的适应证为
A.
休克
B.
轻度脱水,无吸吐者
C.
肾功能不全
D.
心功能不全
E.
明显腹胀
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