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【单选题】
细胞膜内电位由—70mV变为—50mV时称A.
极化
B.
去极化
C.
超极化
D.
复极化
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【单选题】I remember my daughter used to ask some questions that girls _______ would ask. [ ]
A.
twice her age
B.
twice so old as she
C.
as twice old as her
D.
twice old as her age
【简答题】My daughter used to play with the dog by taking a(n) of its hair and then spending a long time rubbing, combing and twisting it.
【单选题】My daughter used to play with the dog by taking a(n) of its hair and then spending a long time rubbing, combing and twisting it.
A.
outrage
B.
outfit
C.
strand
D.
conformity
【单选题】I remember my daughter used to ask some questions that girls ____ would ask.
A.
twice her age
B.
twice so old as she
C.
as twice old as her
D.
twice as old as her old age
【简答题】My daughter used to be kept( )after school because of her sloppy work.
【单选题】照像机系统中标注的光圈F值,下列说法错误的是( )
A.
光圈F是相对孔径（f'/D）的倒数
B.
F值越大，表示系统进光量越大
C.
F值越大，表示系统进光量越少
D.
可变光圈F就是指孔径光阑的大小可以调节
【单选题】塑料模具是指利用其特定（）去成型具有一定形状和尺寸的立体形状塑料制品的工具。 A.密闭腔体 B. 开口腔体 C.密闭和开口腔体 D.任何形状都行
A.
密闭腔体
B.
开口腔体
C.
密闭和开口腔体
D.
任何形状都行
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