A.稱取重量可為1.98~2.02g B.稱取重量可為1.5~2.5g C.稱取重量可為1.95~2.05g D.稱取重量可為1.995~2.005g E.稱取重量可為1.99~2.01g
A.溶質(zhì)(1g或1ml)能在溶劑1~不到10ml中溶解 B.溶質(zhì)(1g或1ml)能在溶劑10~不到30ml中溶解 C.溶質(zhì)(1g或1ml)能在溶劑30~不到100ml中溶解 D.溶質(zhì)(1g或1ml)能在溶劑100~不到1000ml中溶解 E.溶質(zhì)(1g或1ml)能在溶劑1000~不到10000ml中溶解
A.80~90℃ B.70~80℃ C.85~95℃ D.95~100℃ E.98~100℃