加工蚝油的原料是______。
A.贻贝
B.牡蛎
C.扇贝
D.竹蛏
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Tom and Li Ling are good friends. Tom lives in Canada. He is a boy. He likes to draw with markers. He
puts markers on the desk. His favourite colour is yellow. Li Ling lives in China. She is a girl. She likes to write
with pencils. She puts pencils in the pencil case. Her favourite colour is yellow, too.
1. Tom is a __________.[ ]
A. boy
B. girl
C. teacher
2. Tom puts markers ___________ the desk. [ ]
A. in
B. under
C. on
3. Li Ling likes to __________ with pencils.[ ]
A. cut
B. write
C. draw
4. Li Ling's favourite colour is ___________.[ ]
A. red
B. blue
C. yellow
男孩,5岁,2003年9月因发热3天、头痛、呕吐3次,呈喷射状伴腹泻,每天1~2次来诊。体检:神萎、嗜睡、双眼凝视,颈略有抵抗,两肺呼吸音稍粗,心腹无异常。腹壁反射、提睾反射均未能引出,腱反射偏弱。
假如病儿出现呼吸困难,唇周青紫,血pH7.2,PaO6kPa,PaCO8.8kPa,BE3mmol/L以下。处理不恰当的是()
A.应用机械通气
B.保持呼吸道通畅
C.翻身拍背,加强护理
D.维持水、电解质平衡
E.吸氧,并注射碳酸氢钠缓解酸中毒
下列实验中,反应速率加快是由催化剂引起的
A.在炭粉中加入KClO3,点燃使燃烧更加剧烈
B.H2O2中加入少量的MnO2,即可迅速放出气体
C.将炭块粉碎成粉末状,可使燃烧更加充分
D.锌与稀盐酸反应,加入浓度较大的盐酸
自动调节系统中干扰通道放大倍数越大,超调量()。
A.不变
B.先变大后变小
C.越小
D.越大
运动导体在磁场内做切割磁力线运动时,导体内产生感应电势。