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【简答题】
如图所示的杠杆(自重和摩擦不计), O 是支点, A 处挂一重为 50N 的物体,为保证杠杆在水平位置平衡,在中点 B 处沿 _______ (选填 “F 1 ”、“F 2 ” 或 “F 3 ” )方向施加的,为 _______ N。
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参考答案:
举一反三
【单选题】直线y=kx+1(k∈R)与椭圆 x 2 5 + y 2 m =1 恒有公共点,则m的取值范围是(  )
A.
[1,5)∪(5,+∞)
B.
(0,5)
C.
[1,+∞)
D.
(1,5)
【单选题】在下列贸易术语中,卖方承担义务最少的是( )
A.
EXW
B.
CIF
C.
FOB
D.
CFR
【单选题】直线y=x与函数f(x)= 的图象恰有三个公共点,则实数m的取值范围是(  )
A.
[-1,2)
B.
[-1,2]
C.
[2,+∞)
D.
(-∞,-1]
【多选题】HPLC的特点包括()
A.
Widely available
B.
Relatively easy to use
C.
High accuracy and precision
D.
Extended analytical time
E.
Relatively high cost
【单选题】若钝角三角形三内角的度数成等差数列,且最大边长与最小边长的比值为m,则m的范围是(    )
A.
(1,2)
B.
(2,+∞)
C.
[3,+∞)
D.
(3,+∞)
【简答题】( ) as the term we all familiar with, is a relatively large, low-cost, low-margin, high-volume, self-service operation designed to serve the consumer’s total needs for grocery and household products.
【简答题】In electronicpower supplies there is often a need to isolate the output from the input andreduce the weight and cost of the unit. In other applications, such as inaircraft, there is a strong incentive...
【单选题】Which of the following are primary concerns of the bank manager?
A.
maintaining sufficient reserves to minimize the cost to the bank of deposit outflows
B.
extending loans to borrowers who will pay low interest rates, but who are poor credit risks
C.
acquiring funds at a relatively high cost, so that profitable lending opportunities can be realized
D.
maintaining high levels of capital and thus maximizing the returns to the owners
【判断题】M/M/C/∞/∞与M/M/1/∞/∞的区别在于系统中服务台的数量为C。
A.
正确
B.
错误
【单选题】不论k为何值,直线y=kx+1与椭圆 x 2 7 + y 2 m =1有公共点,则实数m的范围是(  )
A.
(0,1)
B.
[1,+∞)
C.
[1,7)∪(7,+∞)
D.
(0,7)
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