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【单选题】
由 x ay,a 应满足的条件是( ) .
A.
a≥0
B.
a≤0
C.
a>0
D.
a<0
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参考答案:
举一反三
【单选题】Don't miss the bus,___you'll be late for school
A.
and
B.
or
C.
so
D.
but
【单选题】如果运算放大器为反相比例运算,R 1 =20 kΩ,R f =100 kΩ,输入电压为0.5 V,则输出电压应为________伏。
A.
-2.5
B.
+2.5
C.
0.1
D.
-0.1 V
【单选题】如果运算放大器为反相比例运算, R 1 =20K Ω, R F =100K Ω,输入电压为 0.5 伏,则输出电压应为 ( ) 伏。
A.
-2.5
B.
+2.5
C.
0.1
【单选题】If you don't get up early, you'll ____ the bus. [     ]
A.
not miss
B.
miss
C.
catch
D.
lost
【单选题】Don't worry! We can get to the bus station in time and _________the early bus.
A.
don't miss
B.
can miss
C.
will miss
D.
won't miss
【单选题】You will miss the last bus __________ you don't hurry up.
A.
unless
B.
if
C.
or
D.
even though
【简答题】Don't worry! We can get to the bus station in time and _________the early bus.A. don't miss B. can miss C. will miss D. won't miss
【单选题】一个投影轮廓线为多边形,另两个投影为一个或若干个有公共顶点的三角形,满足这样条件的投影为( )的投影。
A.
棱柱
B.
棱锥体
C.
棱台
D.
圆锥
【简答题】下图是某细胞增殖和分化的概念图,据图回答下列有关问题: (1)图A表示的是________过程,图B表示的是_______过程。 (2)图中b、c、d、e具有相同的_________。 (3)若e能合成血红蛋白,则b、c、d都__________(不能或能)合成,其主要原因是_______________。 (4)若a为植物细胞,而d能在体外条件下培养成一个植物体,说明d具有___________...
【简答题】单句改错。 1. Cet up early tomorrow. If don't,you'll miss the first bus. __________________________________________________________ 2. I asked him to see the film,but he didn't want. ______________________...
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