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【单选题】
点A(0,0,10),则其水平面的投影在( )。A.
原点
B.
X轴上
C.
Y轴上
D.
Z轴上
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反馈参考答案：
举一反三
【单选题】From the last paragraph it can be concluded that the continuous growth of retired people
A.
will contradict future industrial development.
B.
will stabilize the economies of such communities.
C.
will spoil the relationship between the elderly and the young.
D.
will be good for tourist industry.
【单选题】Which of the following statements is NOT true?
A.
Retired people could only live on fixed incomes.
B.
Retired people are more skillful than young people.
C.
Young people are educated in the new technology.
D.
Young people are keeping pace with rapid changes.
【单选题】黄山风景秀丽,近年来却因有人随意乱扔塑料袋而面目全非,塑料对环境的危害主要在于?
A.
破坏土壤结构
B.
导致土壤的化学污染
C.
.对土壤产生生物性污染
D.
燃烧时造成大气污染
【单选题】Scientists argue that the genetic testing is not perfect partly because ______.
A.
it chiefly centers on predictive gene testing
B.
the health care for patients is not professional
C.
it may arouse the patients' discomfort mentally
D.
it involves the DNA test and biochemistry
【单选题】下列有关组合逻辑电路的说法中,错误的是( )
A.
组合逻辑电路的输出状态只取决于输入信号。
B.
组合逻辑电路没有记忆功能。
C.
组合逻辑电路由门电路组成。
D.
组合逻辑电路有反馈回路。
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