碱式滴定管适宜于装()性溶液,有需要避光的溶液,可以采用()滴定管.
参考答案:碱;茶色或棕色
He said _____ at the meeting and just sat there silently. [ ]
A. something
B. anything
C. nothing
D. everything
平衡舵的平衡比度一般在()
A.0.2~0.3之间;
B.小于0.2;
C.0.3~0.4之间;
D.0.4~0.5之间。