【简答题】径向柱塞泵改变排量的途径是( ),轴向柱塞泵改变排量的途径是( )。
【单选题】What does Student A say about his plans for next term?
A.
She will cut back on courses and earn more money.
B.
She may apply for financial aid.
C.
She will leave the school for a while.
D.
She will complain to the government.
【多选题】测定人体的BMR应在下列哪些条件下进行( )
【单选题】听力原文:M: I heard Helen's going to college. What's she studying? W: She's taking courses in statistics, economics and accounting. Q: What career does Helen probably plan to follow? (18)
B.
Business administration.
【简答题】What are the most popular ESP courses in Britain? [A] Courses for doctors. [B] Courses for businessmen. [C] Courses for reporters. . [D] Courses for lawyers.
【单选题】下列说法中,不正确的是 ( )
A.
用惰性电极电解CuSO 4 溶液(足量)过程中,溶液的颜色逐渐变浅,pH逐渐减小
B.
在正常情况下,人体血液的pH应保持弱碱性范围,为了维持人体细胞内的酸碱平衡,人需要选择不同的酸性食物或碱性食物来加以控制。
C.
在由水电离出的c(OH - )=1×10 -12 mol·L -1 的溶液中,Al 3+ 不可能大量存在
D.
室温下pH=6的酸性溶液中,可能存在NH 3 ·H 2 O分子
【单选题】径向柱塞泵改变排量的途径是( ),轴向柱塞泵改变排量的途径是( )。
【单选题】常温下,下列有关离子浓度及pH大小的比较,正确的是 [ ]
A.
NH 4 + 浓度相同的下列溶液:①(NH 4 ) 2 Fe(SO 4 ) 2 ②(NH 4 ) 2 CO 3 ③(NH 4 ) 2 SO 4 ,溶液浓度由大到小的顺序是:③>②>①
B.
由pH=3的CH 3 COOH溶液与pH=11的NaOH溶液等体积混合,其离子浓度不可能是: c(CH 3 COO - )>c(Na + )> c(H + ) > c(OH - )
C.
pH=13的Ba(OH) 2 溶液与pH=1的HCl溶液等体积混合后,混合溶液的pH>7
D.
pH=12的Ba(OH) 2 溶液与pH=14的NaOH溶液等体积混合,混合溶液的pH范围是13
【单选题】径向柱塞泵改变排量的途径是( ),轴向柱塞泵改变排量的途径是( )。
【单选题】What are the most popular ESP courses in Britain?
B.
Courses for businessmen.
C.
Courses for reporters.