A:标准状况下,22.4 L CO2和O2混合气体中含有的氧原子数约为NA
B:2 mol SO2和1 molO2混合在V2O5存在条件下的密闭容器中反应,反应后分子总数大于2 NA
C:常温常压下,0.1 mol铁在0.1 mol Cl2中充分燃烧,转移的电子数为0.3 NA
D:1 L 1 mol/L的K2CO3溶液中离子总数小于3NA
句型转换 (1)My father works on a farm.(变一般疑问句)____ your father ____ on a farm?(2)What do you think of the yellow dress?(改成同义句)____do you____ the yellow dress?(3)His mother is a nurse.(加doctor构成选择疑问句)____ his mother a nurse____ a doctor?(4) It is 9:30 now.(就划线部分提问)____ is it now?(5)She doesn't have any pears.(变肯定句)She ____ pears.(6)We play volleyball.(改为以Let开头的句子)____volleyball.(7)Can I help you?(改成同义句)What____ I ____ you?
猜谜语。
此物老家在非洲,力大气壮赛过牛,张口大嘴一声吼,吓得百兽都发抖。 (猜一动物)
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