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【单选题】
正弦交流电流的频率为 50Hz ,有效值是 1A , 90 °,其瞬时值表达式为A.
i ( t )=sin(314 t +90 ° )A
B.
i( t )= sin(314 t +90 ° )A
C.
i( t )=cos(314 t +90 ° )A
D.
i( t )= cos(314 t +90 ° )A
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举一反三
【简答题】设有变量定义: int x=2,y=4,z=7 ;写出下列表达式的值以及表达式计算后 x 、 y 、 z 的值。 ( 1 ) z%=x ( 2 ) x/=3 ( 3 )( ++x ) + ( y-- ) ( 4 ) x+y>++z ( 5 ) x=y=z ( 6 ) y!=z ( 7 ) ( x--
【单选题】Do you know insurance(保险)? Buying insurance is a (56) by which people can protect themselves (57) large losses. Protection against fire is one kind of insurance. Large numbers of people pay (58) sums ...
A.
idea
B.
sole
C.
thought
D.
means
【单选题】Do you know insurance(保险) ? Buying insurance is a【56】by which people can protect themselves【57】large losses. Protection against fire is one kind of insurance. Large numbers of people pay【58】sums of mo...
A.
idea
B.
sole
C.
thought
D.
means
【简答题】by a large insurance company ___(12)___ not charts
【单选题】Read the following introductory paragraph and decide the method it used. Life insurance may be defined as a plan under which large groups of individuals can equalize the burden of loss from death by d...
A.
Present a definition
B.
Present an anecdote
C.
Present an important or famous people ’ s saying
D.
Present figures or statistics
【简答题】In Paragraph 6, the author mentions a public service advertisement by a large insurance company. What does this ad point out?
【简答题】Buying insurance (保险) is a way in which people can protect themselves against large losses. Protection against fire is one kind of insurance. Large numbers of people pay small sums of money to an insu...
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【简答题】设有变量定义: int x=2,y=4,z=7 ;写出下列表达式的值以及表达式计算后 x 、 y 、 z 的值。 ( 1 ) z%=x ( 2 ) x/=3 ( 3 )( ++x ) + ( y-- ) ( 4 ) x+y>++z ( 5 ) x=y=z ( 6 ) y!=z ( 7 ) ( x--
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