酚酞指示剂的变色范围是()。
A.3.1-4.4
B.4.4-6.2
C.6.8-8.0
D.8.2-10.0
参考答案:D
It's a lovely day today. Let's go and have a picnic, _______? [ ]
A. will you
B. shall we
C. aren't you
D. don't we
《绿色施工导则》所倡导的“四节一环保”的内容中不包括()。
A.节地
B.节材
C.节电
D.节暖
E.节水