【单选题】打开Dreamweaver样式面板的快捷操作是()。
【多选题】在下列情况中,何种情况对结果产生正误差( )。
A.
以HCl标准溶液滴定某碱样。所用滴定管因未洗净、滴定时管内壁挂有液滴
B.
以K2Cr2O7为基准物、用碘量法标定Na2S2O3溶液的浓度时、滴定速度过快、并过早读出滴定管读数
C.
标定标准溶液的基准物质、在称量时吸潮了(标定时用直接法)
D.
EDTA标准溶液滴定钙镁含量时、滴定速度过快
E.
以失去部分结晶水的硼砂为基准物、标定HCl溶液的浓度。
【单选题】_______is/are used to heat piston cooling oil.
A.
A lubricating oil preheater
C.
A lubricating oil pump
【简答题】请简要概括鲁云谷在交友方面所表现出的特点。( 4 分)
【单选题】听力原文:Suspected insurgents attacked an Islamic school in Thailand last night. Police said three boys were killed and seven were injured.Violence in southern Thailand has increased since the military-in...
【单选题】林启于清道光十九年,出生于福建侯官,在杭州的最大政绩是( ),提倡农桑,并开笃实的士风。