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【单选题】
两个正 两个正弦交流电电流的解析式是 i 1 =10sin(314t+ )A, i 2 =10 , sin(100 πt+ , )A, 这两个试中两个交流电流相同的量是
A.
最大值
B.
有效值
C.
周期
D.
初相位
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举一反三
【单选题】There a pen and two books on the desk .
A.
has
B.
is
C.
were
D.
have
【单选题】There a pen,two pencils and three rulers in the box. [     ]
A.
is
B.
are
C.
has
D.
have
【单选题】There a pen on the table.
A.
is
B.
are
C.
am
D.
were
【简答题】There a pen, a knife and several books on the desk.
【单选题】There a pen,a ruler and some books on the desk.
A.
is
B.
are
C.
have
D.
has
【单选题】中度贫血血红蛋白含量为
A.
100g /L ~ 80g /L
B.
120g /L ~ 100g /L
C.
90g /L ~ 60g /L
D.
60g /L ~30 g /L
【多选题】首页需要关注的指标有()
A.
流量
B.
跳失率
C.
自定义页到宝贝页的点击率
D.
首页到店铺宝贝的点击率
【简答题】给问句选择答语。 (     ) 1. Is this your pen? (     ) 2. Is there a pen on the desk? (     ) 3. What's your father's job? (     ) 4. Is your father a worker? (     ) 5. How many boys are there in your class? ...
【单选题】There a pen and two books on the desk. [     ]
A.
are
B.
have
C.
has
D.
is
【判断题】湖北省水系发达,湖泊众多,省内可控、可用水资源丰富。
A.
正确
B.
错误