皮皮学，免费搜题
登录
搜题
【单选题】
医院CT室的防护门选用铅质材料，目的是为了屏蔽A.
β 射线
B.
X 射线
C.
a 射线
D.
中子
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】When you are dining in a restaurant and you accidentally drop your fork on the floor, you:
A.
Pick it up, wipe it off, and use it anyway
B.
Pick it up, give it to the server, and ask him to bring you another one
C.
Leave it on the floor and ask the server to bring you another one
D.
Leave it on the floor and use your neighbor’s fork when he’s not looking
【单选题】When dining ont, you can ask for ______.
A.
tea or coffee
B.
wine or beer
C.
whatever you want
D.
whatever is being served
【单选题】When you are dining in a restaurant and you accidentally drop your fork on the floor, You ____________.
A.
pick it up, wipe it off, and use it anyway
B.
pick it up, give it to the server, and ask him to bring you another one
C.
leave it on the floor and ask the server to bring you another one
D.
leave it on the floor and use your neighbor's fork when he or she is not looking
相关题目：