单项选择题
若两个系统并联,它的总等效系统的单位脉冲响应等于分系统单位脉冲相应的()。
A.相加
B.相乘
C.相减
D.卷积
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单项选择题
Large quantities of water ____________cooling purposes.needed forB、is needed toC、are need toD、is need for
A、are
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单项选择题
She divided the cake into three pieces and gave her three children ___ a peice.
A、every
B、all
C、both
D、each
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