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【多选题】
下列关于碱式滴定管操作描述正确的是A.
右手手握管,拇指在前,食指在后,其他三个手指辅助夹住出口管,用拇指和食指捏住玻璃珠所在的部位。
B.
挤压橡胶管,使玻璃珠移至手心一侧,溶液即可从玻璃珠旁边的空隙流出;但是要注意不要用力捏玻璃珠。
C.
不要挤压玻璃珠下方的橡胶管,操作时不能使玻璃珠上下移动,以免空气进入而形成气泡,影响读数。
D.
操作过程中要边滴定边摇动锥形瓶,读数时,视线应该与液面的弯月面下沿相切,读数要估读一位。若长期不用玻璃珠和橡胶管取下、洗净,防止老化。
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举一反三
【单选题】The largest non-governmental worldwide organization in the field of transportation which represents today an industry covering about 40000 forwarding and logistics companies is ( ).
A.
FIATA
B.
BIMCO
C.
IMO
D.
IMF
【简答题】简述VLAN的三个类型
【单选题】the largest non-governmental worldwide organization in the field of transportation which represents today an industry covering about 40000 forwarding and logistics companies is ( ).
A.
FIATA
B.
IMO
C.
BIMCO
D.
IMF
【简答题】简述VLAN的概念。
【简答题】请简述VLAN的特点?
【单选题】The term “logistics” is now used more commonly in ( ) field.
A.
military
B.
business
C.
industrial
D.
commercial
【单选题】The largest non-governmental world wide organization in the field of transportation which represents today an industry covering about 40000 forwarding and logistics companies is ( ).
A.
FIATA
B.
IMO
C.
BIMCO
D.
IMF
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