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【单选题】
下列对PLC输入继电器的描述不正确的是（ ）A.
其触点可以在无限次使用。
B.
输入继电器外接的信号变化时，其触点的状态立即发生相应的变化。
C.
输入继电器的线圈只可以由外部信号来驱动。
D.
输入继电器采用八进制编号。
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举一反三
【单选题】两个电容器并联,若C1 = 2 C2,则 C1、C2所带电荷q1、q2的关系是( )。
A.
q1 = 2 q2
B.
2q1 = q2
C.
q1 = q2
D.
无法确定
【单选题】If you're the host, you ___________.
A.
must serve the tea in a friendly way
B.
should buy as much food as you can for the party
C.
should prepare some presents for the guests
D.
must serve the same tea to all the guests
【单选题】关于颅内压增高的临床表现，叙述错误的是（）
A.
头痛在早晨或晚间较重，多位于额部及两颞，性质以胀痛和撕裂痛多见
B.
呕吐常呈喷射状，与进食无关，易发生于饭后，伴或不伴有恶心
C.
视盘水肿早期表现为眼底视网膜静脉扩张、视盘充血，如颅内压增高无改善，可出现视力减退，继发性视神经萎缩，以致失明
D.
单纯的颅内压增高不会引起展神经麻痹及复视
E.
儿童患者头颅叩诊时呈破罐声，可见头皮浅静脉扩张
【单选题】听力原文：W: I just don't understand how Tom got the job when so many others applied. M: It must have been beginner's luck. Q: Why is the woman puzzled? (2)
A.
Tom applied for a job.
B.
Tom was preferred to others.
C.
Tom wanted other job.
D.
Tom was too unlucky.
【单选题】两个电容器并联,若C 1 =2C 2 ,则C 1 、C 2 所带电荷量Q 1 、Q 2 的关系是( )。
A.
Q 1 = 2Q 2
B.
2Q 1 = Q 2
C.
Q 1 = Q 2
D.
不能确定
【简答题】W:If I were ten years younger, I would have got the job. M:Right. They think young girls can do the job better. ( ) 25. Why didn’t the woman get the job?A. She is not old enough. B. She is not longer ...
【单选题】两个电容器并联,若 C1 等于 2C2 ,则 C1 、 C2 所带电荷量 q1 、 q2 的关系是()
A.
q1=q2
B.
q1=2q2
C.
q2=2q1
D.
无法确定
【简答题】根据所给提示填空。 1. If you're s_____________ and you know it, sit and cry. 2. If you're h_____________ and you know it, fan your face. 3. If you're t_____________ and you know it, go to sleep. 4. If you're c...
【简答题】翻译。 1. You're welcome. _________________________________ 2. Have some juice! _________________________________ 3. I like hot dogs. _________________________________ 4. Smell the coffee. ______________...
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