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【简答题】
定义：设x为实数，[x]表示不大于x的最大整数，称为x的整数部分，{x}=x-[x]称为x的小数部分．试解方程：[x]-3{x}=2．
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知识点：
皮皮学刷刷变学霸
举一反三
【多选题】以下对内分泌系统描述错误的是
A.
内分泌腺如甲状腺，胰岛，肾上腺属于内分泌系统
B.
肠道是消化器官不属于内分泌系统
C.
许多非内分泌组织中有内分泌细胞，可合成和分泌激素，但它们不属于内分泌系统
D.
肾上腺皮质和髓质均属于内分泌系统
【简答题】An efficient reader always changes his rate according to his ______ and the difficulty of the reading material.
【简答题】简述列表法处理实验数据。
【单选题】If the error rate of physical link is high, error detection and retransmission is usually more efficient
A.
True
B.
False
【单选题】膨胀珍珠岩 可配得密度在 范围的水泥浆。
A.
1.3-1.8g·cm -3
B.
1.6-1.8g·cm -3
C.
1.1-1.2g·cm -3
D.
1.0-1.2g·cm -3
【单选题】In order to be more productive and efficient, the board decided to ______ a sound system of operation.
A.
institute
B.
inspire
C.
infer
D.
induct
【单选题】The efficient rate of emissions occurs when:
A.
there is absolutely no damage done to a pristine environment.
B.
government forbids all pollution no matter what the cost.
C.
the marginal social benefits of pollution exceed the marginal social costs of pollution.
D.
the change in social benefits and the change in social costs due to an additional unit of emissions are equal.
【单选题】阅读U10的“话题导言”及“开口说”部分,完成以下中英文的匹配选择题。 酒店规模
A.
hotel construction
B.
hotel model
C.
the size of the hotel
D.
the ground of the hotel
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