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【多选题】
下列情况引起的误差,属于系统误差的是( )
A.
标定NaOH用的H 2 C 2 O 4 ×2H 2 O部分风化
B.
试剂中含有微量待测组分
C.
读取滴定管读数时,最后一位数字几次读数不一致
D.
标定HCl溶液用的NaOH标准溶液吸收了CO 2
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举一反三
【单选题】During the period of English Renaissance, ______ was the keynote of the intellectual movement.
A.
literature
B.
superhuman
C.
h umanism
D.
God
【判断题】旅游者的所属群体的规模大小,影响旅游者的从众行为。
A.
正确
B.
错误
【单选题】构成心外膜的结构是
A.
纤维心包
B.
浆膜心包的壁层
C.
纵隔胸膜
D.
浆膜心包的脏层
E.
脏层胸膜
【单选题】心外膜的构成是
A.
间皮和间皮下薄层结缔组织
B.
内皮和薄层疏松结缔组织
C.
致密的结缔组织和间皮组织
D.
网状组织和间皮组织
E.
肌肉组织和间皮组织
【单选题】新鲜尿液呈现混浊的动物是
A.
B.
C.
D.
【单选题】During the period of H1N1 flu,people______not to go to public places
A.
had always been warned
B.
were always being warned
C.
were always warning
D.
always warned
【单选题】新鲜尿液呈现混浊的动物是
A.
B.
C.
D.
【单选题】每只100lx、使用寿命为1000h 的灯泡在服役期共消耗1000 kwh电能;某服务需要1000只这种灯泡,服役中将消耗( )电能Each 100lx bulb with a service life of 1000h consumes a total of 1000 kwh power during the service period; 1000 such bulbs are require...
A.
1kwh
B.
1Mwh
C.
1Bwh
D.
100000kwh
【简答题】无菌包装包括的四个要素是:( );( );( );( )。
【简答题】2–19 The lighting needs of a storage room are being met by 6 fluorescent light fixtures, each fixture containing four lamps rated at 60 W each. All the lamps are on during operating hours of the facil...
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