单项选择题

压力表是指示容器内介质压力的仪表,是压力容器的重要安全装置。按其结构和作用原理,可以分为四类,下列正确的组合是( )。
①液柱式;
②机械牵引式;
③弹性元件式;
④油压操纵式;
⑤活塞式;
⑥电量式

A.②③⑤⑥
B.②③④⑥
C.①③④⑥
D.①③⑤⑥
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单项选择题
听力原文:M: Good morning! What can I do for you, Madam?W: Good morning! I'm looking for a coat.M: What color would you like?W: Could you show me some? I'd like a middle-sized red coat.M: Sorry. We haven't anything in your sizE.W: Do you have a smaller size?M: I'm sorry. The small size coats have just been sold out. What about the blue one? It looks nice and maybe fits you.W: Well, may I try it on?M: Yes, pleasE.W: It seems nice on mE.How much is it?M: 168 yuan.W: OK. Here is 170 yuan, pleasE.M: Your change, pleasE.Thanks.W: You may keep the changE.Good-byE.M: Thank you ! Good-bye !What was the woman going to buy?A.A sweater.B.A shirt.C.A coat.
A.M:
B.
M:
C.
W:
D.
W:
E.
W:
F.
W:
G.
M:
H.
W:
I.
M:
J.A
K.
B.A
L.
C.A
M.
单项选择题
异丙肾上腺素可治疗组胺引起的支气管收缩作用是属于
A.药理性拮抗
B.生理性拮抗
C.相加作用
D.增强作用
E.增敏作用
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