皮皮学，免费搜题
登录
搜题
【单选题】
下述对两类危险源描述不正确的有( )。A.
第二类危险源是事故发生的前提
B.
两类危险源共同决定事故发生的前提
C.
事故发生的可能性由第二类危险源决定
D.
第一类危险源决定了事故发生的严重程度
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Mary often friends online on weekends.
A.
chat with
B.
chats with
C.
chat to
D.
chats to
【简答题】选择与你所听到的句子意义最相近的句子。 1. A. Mary's mother often cooks. B. Mary often helps her mother with the cooking. C. Mary often cooks for her mother. 2. A. Kate is in a red skirt. B. Kate is putting on a red skir...
【单选题】Mary often gets to school .
A.
ride her bike
B.
by the bike
C.
by a bike
D.
on her bike
【单选题】Mary often does some translation work to earn extra money, which half of her income.
A.
makes for
B.
counts on
C.
accounts for
D.
consists in
相关题目：