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【简答题】
Anna: Excuse me. (1)________(We’ve waited / We’ve been waiting) to play tennis since 10:30. It must be our turn now. Tim: I don’t think so. Anna: (2) ________ (We’ve stood / We’ve been standing) here patiently watching you and it’s time for you to stop. How long (3) ________ (have you played / have you been playing)? Tim: Since about 9:30. (4) ________ (We’ve played / We’ve been playing) two matches so far this morning and (5) ________ (we haven’t finished / we haven’t been finishing) the third yet. You’ll have to wait or do something else. Anna: But (6) ________ (you’ve played / you’ve been playing) for more than two hours and it’s our turn now. Tim: I said you’ll have to wait. Anna: We’re tired of waiting and we haven’t got anything to do. (7) ________ (We’ve read / We’ve been reading) the magazines we brought with us. Tim: Why don’t you do something else? (8) ________ (Have you tried / Have you been trying) the swimming pool? Anna: We don’t want to swim, we want to play tennis. Tim: Well, I always play on a Saturday morning. Anyway, (9) ________ (we’ve already started / we’ve already been starting) the third match. Anna: Oh well, it looks like we’ve got no choice, but (10) ________( we’ve booked / we’ve been booking) for next Saturday so you’ll be unlucky then.
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举一反三
【单选题】当孔的上极限尺寸与轴的下极限尺寸之代数差为负值时,此代数差称为
A.
最大间隙
B.
最大过盈
C.
最小间隙
D.
最小过盈
【单选题】以下用于定义线程的执行体的方法是( )。
A.
start( )
B.
run( )
C.
synchronized( )
D.
init( )
【单选题】当孔的上极限尺寸与轴的下极限尺寸之代数差为正值时,此代数查称为
A.
最大间隙
B.
最小间隙
C.
最大过盈
D.
最小过盈
【单选题】下列实验能够成功的是(   )
A.
只用溴水一种试剂可鉴别甲苯、乙烯、乙醇、四氯化碳四种液体
B.
将乙醇加热到170 ℃可制得乙烯
C.
用乙醇、冰醋酸及pH=0的H 2 SO 4 加热可制乙酸乙酯
D.
用酚酞可鉴别苯酚钠和乙醇钠两种溶液
【单选题】当孔的上极限尺寸与轴的下极限尺寸之代数差为正值时.此代数差为(
A.
最大过盈
B.
最大间隙
C.
最小过盈
D.
最小间隙
【单选题】以下用于定义线程的执行体的方法是( )。
A.
start( )
B.
run( )
C.
synchronized( )
D.
init( )
【单选题】下列实验能够成功的是 A . 用氢氧化钠溶液可以除去 乙酸乙酯中乙酸和乙醇 B .将乙醇加热到 170°C 可制得乙烯 C . 只用溴水一种试剂可鉴别甲苯、乙烯、乙醇、四氯化碳四种液体 D .用溴水除去苯中的苯酚杂质
A.
B.
C.
D.
D
【单选题】当孔的上极限尺寸与轴的下极限尺寸之代数差为负数值时,此代数差为
A.
最大间隙
B.
最大过盈
C.
最小间隙
D.
最小过盈
【单选题】当孔的上极限尺寸与轴的下极限尺寸之代数差为正值时,此代数差成为:
A.
最大间隙
B.
最小间隙
C.
最大过盈
D.
最小过盈
【单选题】以下用于定义线程的执行体的方法是( )
A.
start()
B.
init()
C.
run()
D.
synchronized()
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