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【单选题】
The best way to slow down the speed of erosion is to control ______.
A.
the quantity of water
B.
the frequency of rainfall
C.
the quality of soil
D.
the emission of carbon dioxide
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【多选题】In the Stone Forest， the main shapes of limestone are the followings: ______, ______, ______and ______.
A.
mushroom-like limestone
B.
pagoda-like limestone
C.
column-shaped limestone
D.
sword-like limestone
【单选题】The mathematical model of LP consists of three parts ( )
A.
decision variables, objective functions , constraints
B.
decision variable, non-negative constraints , deviation variables
C.
objective variables, decision variables, deviation variables
D.
basic equations, resource constraints and goal constraints
【单选题】A three-phase AC motor, the stator windings of 2p = 4 and Z=36 are double laminated windings, = 2 and , so the pitch and slot pitch angles are respectively ().
A.
6,10°
B.
7,20°
C.
9,30°
【单选题】下列有关累及头颈和臂部动脉的无脉症CTA检查的叙述,错误的是()
A.
检查体位为双手伸直位于身体两侧
B.
扫描范围一般为主动脉弓至头顶
C.
触发扫描时触发层面位于气管分叉水平主动脉
D.
启动检测时间为注射对比剂10秒后
E.
当阈值达200HU时开始扫描
【单选题】下列胸廓入口CT检查后处理技术容积再现()的叙述,错误的是()
A.
直接把三维灰度数据显示在平面屏幕上
B.
可使表面和深部结构同时立体地显示
C.
对细小软斑块显示清楚
D.
可清楚显示颈胸交界处骨折
E.
是CT三维图像处理技术
【多选题】Limestone can be dissolved and carved out by the coexistence of ______and ______
A.
water
B.
carbon dioxide
C.
oxygen
D.
carbon
【单选题】In the general model of linear programming, the unconstrained variables can be replaced by the ( ) of two nonnegative variables
A.
difference
B.
sum
C.
product
D.
quotient
【单选题】A constraint condition is added to the linear programming model, and the scope of feasible region will be ( ) generally.
A.
increase
B.
indefinite
C.
invariable
D.
decrease
【单选题】The three-phase windings of the AC motor are arranged symmetrically in space, and the phase band distribution sequence should be ().
A.
A、B、C、X、Y、Z
B.
A、X、B、Y、C、Z
C.
A、Z、B、X、C、Y
【单选题】What minority lives in the Stone Forest area?
A.
Aini People
B.
Hani People
C.
Bai People
D.
Sani People