单选题:Officials attribute boating accident to __________. 题目分类:理工类 题目类型:单选题 查看权限:VIP 题目内容: Officials attribute boating accident to __________. A.strong winds B.bad weather conditions C.the blockages of waterways D.the lack of safety measures 参考答案: 答案解析:
出生时即可能疑为21-三体综合征患儿的特征是 出生时即可能疑为21-三体综合征患儿的特征是A.智能低下 B.母亲髙龄 C.极低出生体重 D.特征性面容 E.多发畸形 分类:理工类 题型:单选题 查看答案
请根据短文内容,回答题。Energy and Public LandsThe United States boasts 请根据短文内容,回答题。Energy and Public LandsThe United States boasts substantial energy r 分类:理工类 题型:单选题 查看答案
An ultrasonic sound__________. An ultrasonic sound__________.A.is very loud B.does harm to people's health C.is 分类:理工类 题型:单选题 查看答案