下面是一幅有关“劝学”在对联,根据上联,仿写出下联。(4分)
上联:若有恒,何必三更灯,五更鸡;下联:
最无益,莫过一日曝,十日寒。
An infinite sequence of positive integers is called an "alpha sequence" if the number of even integers in the sequence is finite. If S is an infinite sequence of positive integers, is S an alpha sequence ?() (1)The first ten integers in S are even. (2)An infinite number of integers in S are Odd.
A.条件(1)充分,但条件(2)不充分.
B.条件(2)充分,但条件(1)不充分.
C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
D.条件(1)充分,条件(2)也充分.
E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.
温度变送器是将被测温度成比例地转换成为()信号。
A、4~20mADC
B、20~100KPA
C、0~20mA