向H2SO4和CuSO4的混合溶液中不断加入NaOH溶液,下面的曲线正确的是 [ ]
A.
B.
C.
D.
答案:D
Her brother _____ be at home now, because he was seen playing basketball in the stadium just now. [ ]
A. mustn't
B. needn't
C. can't
D. shouldn't
举办营业性涉外或者涉港澳台演出,隐瞒近2年内违反《营业性演出管理条例》规定的记录,提交虚假书面声明的,由()进行处罚。
A.文化市场综合执法机构
B.省级文化主管部门
C.负责审批的文化主管部门
D.县级文化主管部门