缓冲液pH值改变对电泳的影响主要表现在（） A.偏离等电点越远，蛋白质带电越多，电泳

阅读下面的对话，根据上下文，从方框内选择恰当的选项补全对话。（有两项为多余选项）

A:   Excuse me, I am a reporter from a student magazine.      小题1:

B:   Sure, please.

A:        小题2:

B:   I am from Germany.

A:        小题3:

B:   I got here the day before yesterday.

A:   How do you like Lanzhou?

B:  I like your city very much. The people here are very friendly. But I’m still not used to the weather here. I have a sore throat today.

A:   The weather in Lanzhou is kind of dry. Drinking more water can make you feel better.

B:    Thanks for your suggestion.

A:        小题4:

B:   Of course not. I come here for watching Lanzhou International Marathon. And then I’m planning to go to Dunhuang for a tour.

A:   Great. Thank you for answering my questions.       小题5:

B:   Thank you.

Who would you rather ____ with you to the cinema?

A．have go

B．have to go

C．love to go

D．like to go

X、Y、Z是周期表中相邻的三种元素，X和Y同主族，Y和Z的原子的电子层数相同，且X、Y、Z原子最外层电子数之和为16，则这三种元素可能为 [ ]

A．Na、K、Ca

B．N、P、S

C．F、Cl、S

D．O、S、Cl

“TFDS动态检查”的检查范围和预报质量标准规定：非提速铁路货车远芯集尘器无（）、丢失。

安全防范系统三要素之间的关系可以用（）公式进行概括。

A、T反应≥T探测十T延迟

B、T反应十T探测≥T延迟

C、T反应十T探测≤T延迟