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【单选题】
对于α螺旋的下列描述哪一项是错误的？（）A.
通过分子内肽键之间的氢键维持稳定
B.
侧链（R基团）之间的相互作用可影响 螺旋稳定性
C.
通过疏水键维持稳定
D.
是蛋白质的一种二级结构类型
E.
脯氨酸残基和甘氨酸残基妨碍螺旋的形成
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皮皮学刷刷变学霸
举一反三
【单选题】What is the direct labor efficiency variance?
A.
$2,352 F
B.
$2,352 U
C.
$4,320 F
D.
$4,320 U
【单选题】What is said to be the best way to conserve energy nowadays？
A.
Raising efficiency.
B.
Cutting unnecessary costs.
C.
Finding alternative resources.
D.
Sacrificing some personal comforts.
【单选题】What is the best title of this passage?
A.
Less stress, more efficiency.
B.
Attitudes decide everything.
C.
Communication bridges the gap.
D.
You are what you think.
【单选题】A 240-V DC motor(直流马达) draws 6A and develops an output power of 1.6hp. (1 hp=746 W) (a) What is its efficiency? (b) How much the power is wasted?
A.
(a) 82.9% (b) 189 W
B.
(a) 84.9% (b) 246 W
C.
(a) 82.9% (b) 246 W
D.
(a)72.9% (b) 226 W
【简答题】她放弃了工作,以便能照顾两个孩子。
【单选题】According to the passage, what is the purpose of training?
A.
To improve employee efficiency
B.
To spend excess capital
C.
To satisfy government requirements
D.
To please a supervisor
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