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【单选题】
下列叙述正确的是 [ ]A.
常量元素不一定是人体必需元素
B.
人体所需元素很多，因青少年生长发育快，应该多食保健品
C.
人体的无机盐主要是靠食物摄入的，为保证身体发育需要，不能偏食
D.
Na + 存在于细胞内液中，K + 存在于细胞外液中
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【单选题】Which of the following statements is/are true regarding hydraulic pumps in general?
A.
Variable volumes can be obtained with gear pumps only by variation of the pump drive speed.
B.
A radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaft
C.
The amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plate
D.
All of the above
【单选题】Which of the following statements is/are true regarding hydraulic pumps in general?
A.
Variable volumes can be obtained with gear pumps only by variation of the pump drive speed.
B.
A radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaft.
C.
The amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plate.
D.
All of the other alternatives
【单选题】The gear and screw pumps are classified as _____.
A.
variable stroke pumps
B.
multistage pumps
C.
positive displacement pumps
D.
triple-ported pumps
【简答题】计算定期存款本金和利息之和。设银行定期存款的年利率rate为0.5%,并已知存款期为n年,存款本金为capital元,试编程计算n年后的本金和利息之和deposit。要求定期存款的年利率rate、存款期n和存款本金capital均由键盘输入。 语句组2
【单选题】Which of the four classes of ATP-powered pumps share overall similarity: several subunits, the same general organization, and a similar function in being H+ transporters?
A.
ABC superfamily and P-class pumps
B.
ABC superfamily and P-class pump
C.
F-class pumps and P-class pumps
D.
F-class pumps and V-class pumps
【简答题】In general, pumps can be classified as or .
【简答题】编程实现以下功能: ( 2 )假设银行定期存款的年利率 rate 为 2.25% ,并已知存款期为 n 年,存款本金为 capital 元,试编程计算 n 年后可得到本利之和 deposit( 假设不计算复利) 。 提示: 2.25% 编写程序时应写为 0.0225 ,本金和年数未知,从键盘输入。
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