读某时海平面平均气压图,回答3---5题。 3. M处的气压数值可能为 A.1 020,l 012.5 B.1 017.5,1 020 C.1 017.5,1 015 D.1 015
关于下列各实验装置的叙述中,不正确的是 A.装置①可用于分离和的混合物 B.装置②可用于收集等气体 C.装置③中X若为,可用于吸收或HCl,
Tom is eight years old and he’s old enough to himself.A. wear B. dress C. put on
Summers in _______ South of France are for _______ most part dry and sunny.A. 不填;a B. the; 不填 C. 不填;不填 D. the; the 半是晴朗和干燥
They are _______ there. A. near B. to near C. near to D. nearly
When you are done with the book, just give it to Lucy or Helen or __________. A. whoever B. wherever C. whatever D. however
下列做法正确的是( ) A.加入适量的氢氧化钡溶液以除去NaCl溶液中的少量Na2S04 B.加入适量的碳酸钙粉末以除去CaCl2溶液中的少量盐酸 C.用
Being an honest man you shouldn’t tell a l_________.