判断溶液的酸碱性有多种方法。下列溶液中，一定呈碱性的是 [ ]_爱下问搜题

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问题选择题

判断溶液的酸碱性有多种方法。下列溶液中，一定呈碱性的是 [ ]

A．能够使甲基橙呈现黄色

B．溶液的pH>7

C．溶液中：c(H⁺)<c(OH^-)

D．溶液中：c(H⁺)>1×10^-7 mol·L^-1

答案

答案：C

阅读理解

阅读理解。

WHERE TO STAY IN BOSWELL FOUR GUIDE TO OUR BEST HOTELS

Name / Address	The number of the rooms	single	Doubles	Special attractions
First hotel 222 Edward Road Tel. 414- 6433	120	$25	$35	Air-conditioned rooms. French restaurant. Swimming-pool. Shops. Coffee shop and bar. Telephone, radio and television in each room. Close to the city center.
Fairview Hotel 129 North Road Tel. 591-5620	50	$12	$18	Close to the airport. Telephone in each room. Bar. Restaurant. Garage. Swimming-pool.
Orchard Hotel 233 Edward Road Tel. 641-6446	120	$15	$20	Facing First Hotel. European restaurant. Coffee shop. Television. Night-club.
Osaka Hotel 1264 venning road Tel. 643-8200	180	$30	$50	Air-conditioned rooms. Japanese and Chinese restaurants. Swimming-pool. Large garden. Shops.

1. If you want to eat Chinese food, you will go to the restaurant named _______.

A. Fairview Hotel
B. First Hotel.
C. Orchard Hotel.
D. Osaka Hotel.

2. The cheapest price for a single bed is _______ in _______ in Boswell.

A. $12, First Hotel
B. $15, Osaka Hotel
C. $12, Fairview Hotel
D. $25, Orchard Hotel

3. Which hotel faces Orchard Hotel?

A. First Hotel.
B. Osaka Hotel.
C. Fairview Hotel.
D. No Hotel.

判断题

乙炔瓶的瓶阀应戴安全帽储运，瓶体要有防震圈，且须配减压器、回火防止器方可使用。