【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
【判断题】December 24th is known as Christmas Eve.
【多选题】Halloween falls on the eve of All Saints’ Day, also is known as Allhallows or Hallowmas, a holy day in _____________.
【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.
【判断题】80C 51 单片机中共有 21 个特殊功能寄存器,它们的位都是可用软件设置的,因此,是可以进行位寻址的。
【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[ ]。
【判断题】December 24th is known as Christmas Eve.()