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【单选题】
三相电路如图 所示,若电源线电压为220V,则当U相负载短路时,电压表V的读数为___V。A.
0
B.
220
C.
380
D.
190
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举一反三
【单选题】学生关系模式 S（ S＃，Sname，Sex，Age），S的属性分别表示学生的学号、姓名、性别、年龄。要在表S中删除一个属性“年龄”，可选用的SQL语句是
A.
DELETE Age from S
B.
ALTER TABLE S DROP Age
C.
UPDATE S Age
D.
ALTER TABLE S ‘Age’
【简答题】My sister has just returned from a visit to Taiwan, and she was deeply (impress) by the warmth of the people there.
【单选题】My sister has just arrived, but I didn't know she ______ until yesterday.
A.
came
B.
had been coming
C.
will come
D.
was coming
【单选题】姓名、性别、年龄。要在表S中删除一个属性“年龄”,可选用的SQL语句是( )。
A.
UPDATE S Age
B.
DELETE Age from S
C.
ALTER TABLE S ‘Age’
D.
ALTER TABLE S DROP Age
【单选题】My sister has just had a beautiful baby boy, and of course, she _______
A.
thinks the ground of him.
B.
thinks the world of him.
C.
thinks the earth of him.
D.
thinks the floor of him.
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