片状吊钩一般选用Q235或()的钢板,切割成型的多片状铆接而成。
(A)16Mn;
(B)铸铁;
(C)铸钢;
(D)45号钢。
参考答案:A
采用食醋熏蒸进行家庭居室空气消毒时,每立方米空间应用食醋量为()
A.3~5ml
B.5~10ml
C.10~15ml
D.15~20ml
E.20~25ml
An accident happened at ____ crossroads a few metres away from ____ bank.
A.a; a
B.不填;a
C.不填;the
D.the; 不填