A.晶体未研成粉末
B.坩埚未干燥
C.加热过程中晶体爆溅
D.加热时间过长,部分变黑
答案:A
商业银行最主要的资产业务是( )。
A.存款
B.汇兑
C.贷款
D.结算
She ______ a smile when she heard her family went to Italy without her.
A.managed
B.wore
C.performed
D.controlled