【单选题】两个阻值均为 R 的电阻,作串联时的等效电阻与作并联时的等效电阻之比为 ( ) 。
【单选题】质膜的流动镶嵌模型如图所示,①~④表示其中的物质。下列叙述正确的是()
A.
①在质膜的内外侧均有分布,与细胞间的识别有关
D.
④有脂溶性和水溶性两部分,可控制某些离子出入细胞
【多选题】下列各项中,可以表示账户中各项金额之间关系的有( )。
A.
本期期末余额=本期期初余额+本期增加发生额-本期减少发生额
B.
本期期末余额+本期减少发生额=本期期初余额+本期增加发生额
C.
本期期末余额=本期增加发生额+本期减少发生额
E.
本期期末余额-本期期初余额=本期增加发生额-本期减少发生额
【单选题】听力原文:M: In the studio today we have Eve Startling, a career adviser at a well known comprehensive school. Glad to have you with us, Eve. W: Thank you. M: A lot of young people are very nervous when th...
A.
She is a job interviewer.
B.
She is a university professor.
C.
She is a career adviser.
D.
She is a psychologist.
【简答题】两个阻值均为 R 的电阻,作串联时的等效电阻与作并联时的等效电阻之比为[ ]。