下列物质鉴别的实验方法错误的是:
A.A
B.B
C.C
D.D
答案:A
工程建设国家标准由()组织编制并批准。
A.国务院
B.国务院住房和城乡建设委员会
C.国务院住房和城乡建设主管部门
D.标准化主管部门
The magician's talk creates a (n) ______ of attention so that the audience does not see how he does his tricks.
A.diversion
B.derivation
C.disorder
D.interference