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【多选题】
下图(a)上半部为采用( )轴承支承的结构,其结构简单、便于安装, 适于工作温度变化不大的短轴:跨距L≤( )mm。图(a)下半部为采用( ) 轴承支承的结构。
A.
角接触球
B.
深沟球
C.
400
D.
300
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举一反三
【单选题】He often eats [     ]
A.
outside
B.
in outside
C.
in home
D.
at outside
【单选题】—It’s raining outside. Would you please ______me your raincoat? —Sure, here you are.
A.
lend
B.
borrow
C.
return
D.
keep
【单选题】A ______ system placed between the company network and the outside world may limit outside access to the internal network.
A.
firewall
B.
modem
C.
gateway
D.
key
【简答题】A.In Europe B.Outside Europe C.In the USA D.Outside the UK
【单选题】在一些重大险情或事故中,平时物流的经济效益原则将不再作为一个物流活动的中心目标加以考虑,因此应急物流目标具有明显的( )
A.
不确定性
B.
非常规性
C.
突发性
D.
弱经济性
【简答题】outside of anything
【单选题】已知某放大电路电压增益的 频率特性表达式为:( 式中 f 的单位为 Hz ) 试求该电路的下限频率。
A.
25 Hz
B.
20 Hz
C.
15 Hz
D.
10 Hz
【简答题】It is r outside. I need to take an umbrella.
【单选题】A(75)system placed between the company network and the outside world may limit outside access to the internal network.
A.
firewall
B.
modem
C.
gateway
D.
key
【单选题】-- What’ s the weather like? -- Oh, it outside. Take an umbrella with you.
A.
rains
B.
is raining
C.
was raining
D.
rained
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