笔算下列各题.(带☆题要验算)
☆728÷68
641÷23
☆750÷15.
(1)728÷68=10…48;
(2)641÷23=27…20;
(3)750÷15=50.
Lily's mobile phone was left in a taxi accidentally, never______ again.[ ]
A. to find
B. to be found
C. finding
D. being found
按照腐蚀的原理分类,腐蚀分为化学腐蚀和()腐蚀。
A、物理
B、晶间
C、气体
D、电化学