烟花爆竹零售单位不得以任何形式与从业人员订立协议,逃避其对从业人员因生产安全事故伤亡依法应当承担的责任.
参考答案:错
There were dirty marks on her trousers _______ she had wiped her hands.
A.when
B.which
C.where
D.That
地面标筋用()水泥砂浆,宽度一般为80—100mm。
A.1:1
B.1:2
C.1:3
D.1:4