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(4分)家庭常用的食醋中含有醋酸，它是一种有机酸，化学式CH 3 COOH，纯的醋酸是 一种无色液体，具有刺激性气味，同时具有酸的性质，试回答下列问题： （1）写出醋酸一条的物理性质__________________________； （2）在醋酸中，碳元素和氢元素的质量比为_______________； （3）在醋酸中，碳、氢、氧三种元素原子的个数比为 _________________； （4）食醋除作调味剂外，生活中还有些妙用，下列使用食醋肯定不能达到目的是（ ） a.除去菜刀上的铁锈 b.除去水壶壁上的水垢 c.清洗溅到皮肤上的碱液 d.鉴别黄金饰品中是否含有铜
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【简答题】请上传第二遍课文朗读语音。
【简答题】在一局单打比赛中，发球员的分数为0或双数时，双方运动员均应在各自的（）发球区发球或接发球。
【单选题】Jim: I've had a lot of trouble getting through to you. Your call center wouldn't put me through. Clerk: I'm sorry. We've been very busy this morning . What can I do for you ? From the conversation abo...
A.
the phone
B.
calling
C.
the call center
D.
understanding
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【单选题】.Clerk: Do you know the flight number?Guest: ________________.
A.
Yes, he is Tom
B.
Yes, it’s CA900.
C.
The flight is a direct flight.
D.
Here you are.
【简答题】J5 -9-11 Part three: According to the following directions, try to give a brief presentation to the question. 1. Directions: You work as a waiter in a restaurant. After finishing taking the guest’ ord...
【单选题】Customer: Excuse me.______. Clerk: The rate for airmails is two dollars.
A.
Do you do international delivery?
B.
Can you tell me the money I need to post a letter?
C.
How much is a letter to South Mrica?
D.
Do you happen to know how fast airmails are?
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