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【简答题】
PLC具有逻辑运算功能，能够描述继电器触点的和等各种连接。
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举一反三
【单选题】患者女性，64岁。糖尿病病史10余年，近1年经常出现活动后心慌气短，伴有心前区疼痛，休息后可缓解。考虑该患者可能合并
A.
微血管病变
B.
周围神经病变
C.
白内障
D.
大血管病变
E.
酮症酸中毒
【单选题】Mary can’t attend the party _____ at Tom’s house at present ______ at Jenny’s house tomorrow.
A.
being held to be held
B.
to be held held
C.
held being held
D.
to be held to be held
【简答题】一个工厂由于采用新工艺，现在每件产品的成本是20.4元，比原来降低了15%．原来每件产品的成本是多少元？
【单选题】My train arrives there at eight. The plane I would like to take by then.
A.
will have left
B.
has left
C.
had left
D.
would leave
【简答题】Tom ______ the party as no one saw him there yesterday evening. A) can't attend B) mustn't attend C) won't have attended D) couldn't have attended
【单选题】Some students can't attend ground classes because they ______.
A.
are too lazy
B.
don't have the money to study
C.
may not be able to attend classes for military reasons
D.
are sick or too busy
【简答题】根据下列题干，回答 124～126 题： 女性，28岁，因反复心慌气短1年，加重2天人院。平时劳累和感冒时症状加重，不能平卧，痰中带血。7年前有关节疼痛史。查体：BP l50/60mmH9，半卧位，颈静脉充盈，颈部搏动明显，双侧肺底部湿哕音。胸骨左缘第2肋间舒张期叹气样杂音，向心尖部传导；心尖部舒张期隆隆样杂音，无传导；周围血管征阳性。胸片示“靴形心”。 第 124 题 该患者初步诊断为（ ）。
【简答题】为了避免正反转电路的主电路发生两相电源短路事故发生,将接触器 KM1 和 KM2 常闭触点分别串接在对方线圈电路中,形成相互制约的控制,称为 ________ 或 ________ 控制。
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