有两瓶pH为2的酸溶液，一瓶是强酸，一瓶是弱酸，可用来鉴别其中哪一瓶是弱酸的一组试剂是（ ） A.石蕊和水
右图为衢州历史名人赵抃祠，赵抃字阅道，衢州西安（今浙江衢州 市）人。景祐元年进士，任殿中侍御史，弹劾不避权势，时称“铁 面御史”。平时以
、已知，则实数的值为( ) （A）1 (B) -1 (C) 2 (D) -2
It is worth ____ considering the problem. A.when B. as C. while D. since
某大型游乐场内，有一种能使人感觉身体超重、失重的大型娱乐设施，该设施用电梯将乘坐有十多人的座舱悬停在几十米的高空处，然后让座舱从高空
In Shanghai, people______ thousand tons of watermelon every summer. A. swallow B. eat C. consume D. exhaust
Growing up in the USA, I was ashamed of my mother’s Chinese English. Because of her English, she was often treated unfairly. People in department stores, at banks, and at restaurants did not take he
