皮皮学，免费搜题
登录
搜题
【单选题】
下列细胞器中并非植物细胞特有的是（ ）。A.
体
B.
细胞壁
C.
液泡
D.
质体
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】May we please have your attention for the safety demonstration? If you have any questions after ____________, please contact the flight attendants. Thank you!
A.
the safety video
B.
video system
C.
amusement
D.
demonstration
【单选题】_____ being prepared for the flight, the crew also ensure that all passengers know safety matters.
A.
Beside
B.
Not only
C.
As well as
D.
In addition
【单选题】The PIC is the person legally ________ the aircraft and its flight safety and operation and would normally be the primary person liable for a violation of any flight rule.
A.
in case of
B.
in the event of
C.
in charge of
D.
in the charge of
【单选题】我国信息安全面临的威胁有( ) 1主要技术依赖进口,信息产业受制于人 2信息安全的防护能力较弱 3信息安全管理机构尚不完善 4信息安全意识亟待提高 5信息传播速度急剧加快
A.
①②③④⑤
B.
①②③④
C.
①②③⑤
D.
②③④⑤
【单选题】Pilots train on flight simulators for safety, learning efficiency, and cost savings. This is an example of ________.
A.
apprenticeship training
B.
on-the-job training
C.
vestibule training ( 技工培训 )
D.
programmed learning
【简答题】信息安全面临的主要威胁有哪些?
相关题目：