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【单选题】
The cooking, the cleaning and the childcare were all amazing bonuses that I don't dare complain about...A.
The cooking, the cleaning and the childcare were done amazingly so I had no reason to complain about my husband...
B.
The cooking, the cleaning and the childcare were an unexpected huge help that I cannot think of complaining about...
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举一反三
【单选题】当发生火灾时，以下错误的做法是（ ）。
A.
可用厚重的衣物压灭身上的火苗
B.
迅速乘电梯到一楼逃生
C.
大火封门时用浸湿的衣物或棉被封堵门缝
D.
被困楼上时站在窗边等待消防人员救援
【单选题】The scientist's work was based on _______.
A.
occasional observations
B.
systematic observations
C.
observations of several nests
D.
observations of undisturbed nests
【简答题】Dogs are often praised for their ________; they almost never abandon their s. A) faith B) loyalty C) trust D) truthfulness
【单选题】This text indicates that the basic component of scientific research is ______.
A.
observation
B.
hypothesis
C.
reasoning
D.
interpretation
【单选题】Dogs are often praised for their ______ they almost never abandon their masters.
A.
faith
B.
loyalty
C.
trust
D.
truthfulness
【单选题】The author implies that ______.
A.
it is sometimes easier to detect supernovas by observation of the X-ray spectrum than by observation of visible wavelengths of light
B.
life on the earth is endangered by its constant exposure to radiation forces that are released by a supernova
C.
recently discovered meteorites indicate that the earth and other planets of our solar system survived the explosion of a supernova several billion years ago
D.
lighter elements are formed from heavier elements during a supernova as the heavier elements are torn apart
【简答题】如图所示为滚子式对心直动从动件盘形凸轮机构。已知:圆盘半径 mm,偏心距 mm,滚子半径 mm。要求: (1)标出图示位置机构的压力角 ; (2)试计算或在图上作图标出从动件的升程h; (3)在图上标出推程角 和回程角 ; (4)确定凸轮的基圆半径r b ; (5)在图上画出凸轮的理论轮廓曲线。
【单选题】下列说法错误的是( )。
A.
当楼房突然发生火灾时，首先要强令自己保持镇静，切不可惊惶失措，以免做出错误的决断
B.
逃生的路线要注意，朝有照明或明亮处迅速撤离
C.
着火时，若在楼梯上，往下往上跑都可以
D.
着火时，若被火档住，通过窗口或阳台等往外逃生
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