ZNR突波吸收器

—Excuse me, can you tell me the way to the zoo? 

—Sorry, I’m new here. Please ask that policeman. He ______ know.

A. can       B. need    C. may

根据对话内容，从对话后的选项中选出能填入空白处的最佳选项。选项中有两项为

多余选项。

A: Some of our classmates are going to Japan for the summer vacation． Will you join them?

B :  小题1: But I have to go back home to stay with my mother because she is badly ill in bed．

A : Oh, that’s too bad!

B :  小题2:

A : Yes, my aunt in Hawaii has invited me to spend my vacation with her．

B : Great ! Hawaii is a wonderful place, isn’t it?

A : Certainly, I suppose she’ll show me around some interesting places there．   小题3:

B : As I know． Hawaii was discovered by Captain Cook in the 1770s and he got killed there the next year he discovered it．

A : That’s right．  小题4:

B : Sure, you’ll certainly enjoy yourself． But don’t forget to write to me, will you?

A :  小题5: 

A : Of course, I will．

B : But now it’s become a world – famous scenic spot．

C : I would go to, should I have the chance．

D : Have you got a way to spend yours?

E : No, never．

F : And I’m going to read some books about its history as well．

G : And I’ll go there as soon as the vacation starts．

佝偻病颅骨软化多发生于

A．1个月

B．2～3个月

C．3～6个月

D．6～9个月

E．6～12个月

企业在计算持有现金总成本时，通常应考虑的因素有( )。

A．现金持有量

B．有价证券的报酬率

C．全年现金需求总量

D．一次的转换成本

E．现金持有时间

两步滴定法用于阿司匹林片剂的含量测定，第一步为（），第二步（）。