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【单选题】
We can see from the passage that the author seems to be______about the prevention of genetic diseases.A.
suspicious
B.
unconcerned
C.
pessimistic
D.
optimistic
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举一反三
【单选题】5 Mark suggests that they _____.
A.
eat their picnic while travelling along the river
B.
move over to the bank and stop for a while
C.
eat their picnic in about ten minutes
D.
move over to the bank and eat their picnic
【简答题】Marksuggests that they _____.A. (a) eat their picnic while travelling along the river B. (b) move over to the bank and stop for a while C. (c) eat their picnic in about ten minutes D. (d) move over to...
【单选题】Mark suggests that he punt for _____.
A.
half an hour
B.
the first 20 minutes
C.
the first hour
D.
most of the trip
【简答题】51系列单片机具有几个中断源?其中哪些中断源可以被定义为高优先级中断,如何定义?
【单选题】设信号的波特率为500Baud,采用复合调制技术,由4种幅度和8种相伴组成16种码元,则食道的数据率为:
A.
500 bps
B.
1000 bps
C.
2000 bps
D.
4800 bps
【简答题】椭圆C的中心在坐标原点O，焦点在y轴上，离心率为 2 2 ，以短轴的一个端点与两焦点为顶点的三角形的面积为 1 2 ． （1）求椭圆C的方程； （2）若过点P（0，m）存在直线l与椭圆C交于相异两点A，B，满足： AP =λ PB 且 OA +λ OB =4 OP ，求常数λ的值和实数m的取值范围．
【简答题】51系列单片机具有几个中断源,分别哪几个?其中哪些中断源可以被定义为高优先级中断,如何定义?
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