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【单选题】
Which command encrypts all plaintext passwords?（）A.
Router(config)#password-encryption
B.
Router(config)#service password-encryption
C.
Router#service password-encryption
D.
Router# password-encryption
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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
【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】光圈的大小用F数来表示,F值越大,实际进光量越 。
【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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