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【判断题】
根据《建筑砂浆基本性能试验方法标准》(JGJ/T70-2009)规定，砂浆的抗压强度是以3个70.7mm×70.7mm×70.7mm的立方体试块，在标准条件(温度为20±1℃，相对湿度为90%以上)下养护28d后，用标准方法测得的抗压强度(MPa)来评定。A.
正确
B.
错误
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【单选题】Electrical feedback is usually a result of ________.
A.
Too high a voltage in a circuit
B.
Too much current (in amperes) in a circuit
C.
Lack of a proper ground
D.
Both a and b
【单选题】Psychological researchers generally recognize that facial expressions reflect emotional states. In fact, various emotional states give rise to certain patterns of electrical activity in the facial mus...
A.
The reactions of people in experiments to cartoons
B.
The tendency of people in experiments to cooperate
C.
The release of neurotransmitters by people during experiments
D.
The long-term effects of repressing emotions
【单选题】甲状腺滤泡旁细胞分泌的激素
A.
作用于破骨细胞,使血钙下降
B.
作用于破骨细胞,使血钙升高
C.
作用于成骨细胞,使血钙下降
D.
作用于成骨细胞,使血钙升高
E.
作用于骨细胞,使血钙下降
【单选题】科学问题具有真实性,这是指该问题
A.
不是科学研究者虚构的问题
B.
是可以被科学事实加以实证的问题
C.
是科学研究中迫切需要解决的问题
D.
是科学认识主体尚未解决的问题
【简答题】（Unit 8）试写出下列单词和词组的中文意思。 1）electrical 2）decode 3）command 4）electrical device 5）feedback unit
【单选题】The mounting pile of failure creates a negative feedback loop that threatens Facebook's future in other ways. Indeed, the more Facebook's disappointment in the market is catalogued, the worse Facebook...
A.
a shape like a ring
B.
a circle
C.
a complete circuit for electrical current
D.
a set of instructions
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