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【简答题】
已知干空气的气压为 1000hPa ,气温为 300K ,试求其密度?(保留两位小数,单位 kg/m 3 )
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皮皮学刷刷变学霸
举一反三
【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 milk 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】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
【单选题】During an action potential, calcium is released into the sarcoplasm, near the actin and myosin molecules. Which of the following is the best explanation of what the calcium does?
A.
The calcium binds to the actin and myosin and makes them work together.
B.
The calcium breaks apart ATP to ADP and P.
C.
The calcium removes the tropomyosin block.
D.
The calcium causes the release of acetylcholine.
【单选题】Which statement is NOT true about effects of calcium overload on nerve cells?
A.
Calcium overload induced decreased glutamate level in brain
B.
Calcium overload interfering with tissue energy metabolism
C.
Calcium overload aggravates cerebral ischemia and hypoxia
D.
Calcium overload induced ROS production
【单选题】VB提供了结构化程序设计的三种基本结构,三种基本结构是( )。
A.
递归结构、选择结构、循环结构
B.
选择结构、过程结构、顺序结构
C.
过程结构、输入输出结构、转向结构
D.
选择结构、循环结构、顺序结构
【简答题】Which of the following statements is NOT true? [A] Today you can get calcium without eating any high-fat or high-calorie food by choosing skim milk or low-fat yogurt. [B] Calcium plays an important ro...
【单选题】VB提供了结构化程序设计的三种基本结构,这三种基本结构是()
A.
递归结构、选择结构、循环结构
B.
过程结构、顺序结构、转向结构
C.
递推结构、顺序结构、选择结构
D.
顺序结构、选择结构、循环结构
【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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