根据气云密度与空气密度的相对大小,将气云分为()。
A. 重气云
B. 中性气云
C. 轻气云
D. 高斯气云
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爆炸分为()。
A. 物理爆炸
B. 化学爆炸
C. 核爆炸
D. 凝聚相爆炸
设有10张奖劵,其中8张为2元,2张为5元,现从中无放回地随机抽取3张,则得奖金额(单位:元)的数学期望是
1.It isn't fair for the police to ticket acar only minutes after the parking meter runsout.
A. Fact
B. Opinion
C. Fact and Opinion
2.The first parking meters were installed in Oklahoma City, Oklahoma, in July of1935.
A. Fact
B. Opinion
C. Fact and Opinion