Thuốc thử duy nhất dùng để nhận biết các chất sau: Ba(OH)₂, NH₄HSO₄, BaCl₂, HCl, NaCl, H₂SO₄ đựng trong 6 lọ bị mất nhãn là

A. dd H₂SO₄

B. dd AgNO₃

C. dd NaOH

D. quỳ tím

Dựa vào số liệu bảng 35.1 (SGK trang 127), hãy nhận xét tình hình dân cư, xã hội ở Đồng bằng sông Cửu Long so với cả nước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 34 to 38

As a result of the recent oil crisis, 9.9 million of California’s 15 million motorists were subjected to an odd – even plan of gas rationing. The governor signed a bill forcing motorists with license plates ending in odd numbers to buy gas only on odd – numbered days, and those ending in even numbers on even – numbered days. Those whose plates were all letters or specially printed had to follow the odd – numbered plan.

Exceptions were made only for emergencies and out – of – state – drivers. Those who could not get gas were forced to walk, bike, or skate to work.

This plan was expected to eliminate the long lines at many service stations. Those who tried to purchase more than twenty gallons of gas or tried to fill a more than half filled tank would be fined and possibly imprisoned.

All of the following are true EXCEPT__________.

A. officials hoped that this plan would alleviate long gas lines

B. California has 9.9 million drivers

C. the governor signed the bill concerning gas rationing

D. a gas limit was imposed