搜题

【单选题】

If you heard a ‘crackling’ noise in centrifugal pump, the most probable cause of the problem would be（）

A、insufficient speed

B、cavitation

C、excess discharge pressure

D、excessive net positive suction head B

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第1题

[单选题] Pleased to meet you! ―（）

A、Pleased to meet you ,too. B、How do you do? C、I've heard about you. D、The pleasure is mine

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第2题

[单选题] A:Hello, David! I haven't heard from you for a long time. How have you been recently? B:（）

A、That's ok B、Long time no see C、Not bad, thank you

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第3题

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A、heard B、heard of C、heard from D、heard a lot

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第4题

[判断题] If you have any questions, please feel free to interrupt at any time. This sentence means if you have something that you don’t understand, you can make a break in at any time.

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第5题

[单选题] --Do you know who telephoned me? --（）

A、No，I didn’t phone you. B、Yes，I know you well. C、I heard it was Sally. D、Yes，I remember it now.

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第6题

[单选题] I look forward to（）from you.

A、heard B、hearing C、hears D、hear

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第7题

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A、listen; hearing B、hear; listening C、be listening; heard D、be hearing; listened to

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第8题

[单选题] I'd like to know something about your life in Paris. （）

A、You can tell me. B、I wonder if you can. C、I‘ll tell you. D、I wonder if you could.

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第9题

[单选题] You work as a technician at TestKing. You are configuring a Cisco router. You want to configure the IP address on an interface.Which command should you use?（）

A、router(config-if)#ip address 142.8.2.1 subnet mask 255.255.252.0 B、router(config-if)#142.8.2.1 0.0.3.255 C、router(config-if)#ip address 142.8.2.1 255.255.252.0 D、router(config-if)#142.8.2.1 subnet mask 255.255.252.0 E、router(config-if)#ip address 142.8.2.1 0.0.3.255 F、router(config-if)#ip address 142.8.2.1 subnet mask /22

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