皮皮学，免费搜题
登录
搜题
【单选题】
分光光度计操作第一步开机操作正确的是( )。A.
开机不预热直接使用
B.
开机预热20分钟，光路打开，模式在T档
C.
开机预热10分钟，光路断开，模式在A档
D.
开机预热20分钟，光路断开，模式在T档
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】His new car broke down yesterday, it needs _____. [ ]
A.
repaired
B.
being repaired
C.
to repair
D.
repairing
【单选题】What happened to the man?
A.
His car broke down.
B.
He broke his phone.
C.
He lost his way.
【单选题】The car______halfway for no reason.
A.
broke off
B.
broke out
C.
broke up
D.
broke down
【单选题】His car ___ on his way home yesterday. A. broke B. was broke C. was down D. breaking
A.
broke
B.
was broke
C.
was down
D.
breaking
【单选题】His race-car _____ halfway. He had to give up the race. [ ]
A.
broke down
B.
broke in
C.
broke up
【简答题】文件B如果想使用头文件A中声明的函数，则需要在B文件中适当位置添加_________
【单选题】A stranger ___ his room without his permission.
A.
broke up
B.
broke out
C.
broke into
D.
broke down
相关题目：