【单选题】Cats and dogs often have dreamless sleep.
【单选题】革兰氏染色时最好选择处于( )的微生物细胞进行染色
【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 ______.
【单选题】Dogs are often praised for their ______ they almost never abandon their masters.
【单选题】We notice this ____ true very often with dogs and cats.
【单选题】当温度降低时,植物体内有机物的运输速率会( )。
【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
D.
着火时,若被火档住,通过窗口或阳台等往外逃生