下列物质中,既能跟稀硫酸反应,又能跟NaOH溶液反应的是( )①Al2O3;②Mg(OH)2;③Al(OH)3;④(NH4)2CO3;⑤NaHCO3;⑥AlCl3
Who can make a sentence ______“apple” A.with B.in C. And
It’s too late. But I am still waiting _______ the bus. A. of B.to C.for
Liu Tao can not find his e-book, so he is __________ it. A. looking out of B.looking after C. looking for
Please listen to _______. A. him B. he C. we
The______ invented the aeroplane. A. Scottish B. Americans C. British