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【单选题】
商业和手工业从农业中分离出来,这是人类的()劳动大分工。A.
第一次
B.
第二次
C.
第三次
D.
第四次
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反馈参考答案：
举一反三
【单选题】环境为Ⅱ类区域的空气及工作人员手微生物监测合格的标准分别是：( )
A.
细菌总数≤10cfu/m3、≤5cfu/cm2
B.
细菌总数≤200cfu/m3、≤5cfu/cm2
C.
细菌总数≤200cfu/m3、≤10cfu/cm2
D.
细菌总数≤500cfu/m3、≤10cfu/cm2
【简答题】Fires may do more damage than the earthquakes(地震).
【单选题】用图形描述数据是描述性统计分析常用的方法，下面的说法错误的是______。
A.
散点图适合表示两个定量变量间的关系，散点的疏密程度可以反映两变量间的相关程度。
B.
SAS的GPLOT过程可以绘制散点图、线图
C.
盒形图直观表示数据的最大/小值、上/下四分位数和中位数。
D.
SAS的GCHART过程可以绘制茎叶图
【单选题】Large volumes of carbon dioxide are safe and effective for fighting fires in enclosed spaces, such as in a pumproom, provided that the ______.
A.
persons in the space wear gas masks
B.
persons in the space wear damp cloths over their mouths and nostrils
C.
ventilation system is secured and all persons leave the space
D.
ventilation system is kept operating
【单选题】According to the passage, a fire storm______.
A.
is often seen when large forest fires break out.
B.
often occurs after the atomic explosions
C.
produces forces that draw everything into the fire
D.
is a disaster that can destroy everything in the area
【简答题】The prive measures for forest fires include some preemptive(抢先)methods that can help reduce the risks of fires and control their severity and spread，and thus, maintain ecological balance and prot...
【单选题】Large fires can do more than __________ vegetation and clog the skies with smoke.
A.
scorch
B.
blight
C.
perish
D.
exquisite
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