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【单选题】
(*必考)婴儿用于食物特殊动力作用所需能量占总需能量的百分比是（）
A.
9〜10%
B.
7〜8%
C.
5〜6%
D.
4〜5%
E.
3〜4%
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Until about 30 years ago, language researchers focused their studies on infants who had already begun to babble, according to Jusczyk, who has written a book on how children acquire language titled Th...
A.
By listening to the sounds.
B.
By repeating the sounds.
C.
By listening to their own babbling.
D.
By uttering the sounds.
【单选题】qz149: 某加速器将电子加速到能量E = 2×106 eV时,该电子的动能EK =( )eV。(电子的静止质量me = 9.11×10-31 kg, 1 eV =1.60×10-19 J)
A.
2.49×106
B.
1.49×106
C.
1.67×106
D.
2.67×106
【单选题】设备是在各种不同的环境条件下运转的，承受着各种（ ）与能量的作用，这些作用会使设备的技术状态发生变化，设备的性能劣化，最终导致设备发生故障。
A.
应力
B.
力量
C.
能量
D.
压力
【单选题】蛋白质、脂肪、碳水化合物提供的能量在全日总能量中所占的百分比以多少为宜:
A.
10-15%,20-30%,55-65%
B.
20-30%,10-15%,55-65%
C.
10-15%，20-30%,55-65%
D.
20-35%,10-15%,50-60%