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【单选题】

以下干筛法筛分操作中,可能导致筛分结果无效的是()①筛分后计算损耗率,发现损耗超过试样质量的1%。②人工筛分,发现通过筛孔的集料质量小于筛上残余量的0.1%持续了5min才停止筛分③筛分过程中,部分颗粒散落到地上,与其它未参与筛分集料混在一起,凭感觉把每颗捡回来重新加入筛分④试样在室内风干后直接进行筛分

A.
①②③
B.
②③④
C.
①③④
D.
①②④
E.
②④
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【单选题】Help Wanted Ads Clerk Part time mornings, drive to work, indoors (在室内) NATIONWIDE AUTO PAINTING 1850 Atlantic (大西洋的) Ave. Brooklyn Btwn Utica 467—1414 CHEM ENG. Director R&D Direct research and de...

A.
Help Wanted Ads
B.
Clerk
C.
Part time mornings, drive to work, indoors (在室内) NATIONWIDE AUTO PAINTING
D.
1850 Atlantic (大西洋的) Ave. Brooklyn Btwn Utica 467—1414 CHEM ENG. Director R&D
E.
Direct research and development for chem. Process industry Ph D, MS or equiv (相等的,等价物).
F.
Elias 210—351—7100
G.
$ 29-$ 34 000
H.
ACME agency
I.
125 BroodEliz NJ 07201
J.
CHEF
.
F/T. Experiences, must speak Italian and English, Bklyn loc, 435-1872 aft 12 noon Except Tues.
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【单选题】Help Wanted Ads Clerk Part time mornings, drive to work, indoors (在室内) NATIONWIDE AUTO PAINTING 1850 Atlantic (大西洋的) Ave. Brooklyn Btwn Utica 467—1414 CHEM ENG. Director R&D Direct research and de...
A.
Help Wanted Ads
B.
Clerk
C.
Part time mornings, drive to work, indoors (在室内) NATIONWIDE AUTO PAINTING
D.
1850 Atlantic (大西洋的) Ave. Brooklyn Btwn Utica 467—1414 CHEM ENG. Director R&D
E.
Direct research and development for chem. Process industry Ph D, MS or equiv (相等的,等价物).
F.
Elias 210—351—7100
G.
$ 29-$ 34 000
H.
ACME agency
I.
125 BroodEliz NJ 07201
J.
CHEF
.
F/T. Experiences, must speak Italian and English, Bklyn loc, 435-1872 aft 12 noon Except Tues.