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【单选题】
技师甲说：叶片泵中的叶片如果其边缘被磨平，就必须更换；技师：所有叶片泵叶片的尺寸都是可变的。谁正确？A.
甲正确
B.
乙正确
C.
两人均正确
D.
两人均不正确
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】设有下列声明语句 : int i,j; float x,y; double u,v; 下列哪些赋值是合法的 ?( )
A.
i=x;
B.
x=u+y;
C.
v=x
D.
y=u+i*x
【单选题】设有下列声明语句: int i,j; float x,y; double u,v; 下列哪个赋值是合法的?( )
A.
x=u+y;
B.
i=x;
C.
x=v
D.
y=ji*x
【简答题】在“学生—选课—课程”数据库中的两个关系如下： s(sno,sname,,age) sc(sno,cno,grade) 则关系代数表达式πs.sname,grade( )等价的SQL命令是SELECT s.sname,sc.grade FROM s,sc WHERE______AND s.age＞20
【简答题】细胞的形态结构与( )的相关性和一致性是很多细胞的共同特点。
【单选题】设有下列声明语句: int i,j; float x,y; doubleu,v; 下列哪些赋值是合法的?( )
A.
i=x;
B.
x=u+y;
C.
v=x
D.
y=j/i*x
【单选题】设有下列声明语句 : int i,j; float x,y; double u,v; 下列哪个赋值是合法的 ?( )
A.
i=x;
B.
x=u+y;
C.
x=v
D.
y=ji*x
【单选题】Children are often ______ about everything they have never met before.
A.
familiar
B.
content
C.
curious
D.
satisfied
【简答题】Fill in each of the blanks with a correct word or phase: handicap, physical, junk, accent, a couple of, witness, tucked, correspondence, issue, trial They have never met, but they have been in ______ ...
【单选题】If your friend have a crash on someone on Wechat and they have never met each other, you should_____.
A.
. think her/his behavior is so silly and pay no attention to it.
B.
to blame him/her .
C.
Tell him/her to enlarge the of real-life friends.
D.
Do the same thing as him/her.
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