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【单选题】
为了保证旅游者在发生火灾时能尽快疏散,导游A.
熟悉酒店楼层安全出口的位置
B.
熟悉酒店楼层电梯间的位置
C.
禁止旅游者抽烟
D.
提醒旅游者阅读客房内的服务指南
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】在本征半导体中加入 元素可形成 P 型半导体,加入 元素可形成 N 型半导体。
【单选题】If the marginal product of capital doesn't change as the amount of capital increases, a figure showing the relationship between output and capital
A.
is a straight line with constant upward slope.
B.
is a straight line with a slope of zero.
C.
is a vertical line.
D.
slopes upward with a slope that declines as the amount of capital increases.
【单选题】The marginal product of capital is:
A.
output divided by capital input.
B.
additional output produced when one additional unit of capital is added.
C.
additional output produced when one additional unit of capital and one additional unit of labor are added.
D.
value of additional output when one dollar's worth of additional capital is added.
【判断题】嫉妒心理产生源于两种错误的认识：一是认为别人取得了成绩，就说明自己没有成绩，别人成功了就说明自己失败了；二是认为别人的成功就是对自己的威胁，是对自己利益的侵害。
A.
正确
B.
错误
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