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【单选题】
2014年,某地区有100家生产皮鞋的企业,要研究他们的产品情况,总体单位是( )A.
每一个企业
B.
所有 100家企业
C.
每一双皮鞋
D.
所有企业生产的皮鞋
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皮皮学刷刷变学霸
举一反三
【单选题】The relaxation of skeletal muscle relies on the activity of the ________, which decreases cytoplasmic calcium concentration.
A.
ryanodine receptor
B.
dihydropyridine (DHP) receptor (L-type calcium channel)
C.
acetylcholine receptor
D.
Ca2+ ATPase
【简答题】下列不属于Word窗口组成部分的是( )
【简答题】Besides calcium and iron, athletes also need______which will help them access energy and pr them from getting ill.
【单选题】Which of the following statements is NOT true?
A.
Today you can get calcium without eating any high-fat or high-calorie foods by choosing skim mill or low-fat yogurt.
B.
Calcium plays an important role in the movement of protein and nutrients inside cells.
C.
You can rely on pills instead of a calcium-rich diet to take enough calcium.
D.
If you want to absorb calcium, you should expose yourself to the sun's rays.
【单选题】We may infer that 'iodine, fluoride and calcium' are______.
A.
substances which act positively or negatively on man's health
B.
harmful substances in the water supply
C.
substances which help provide breeding places for pests
D.
substances contributory to good health
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