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【单选题】Losing Weight Girls as young as 10 years old are dieting and in danger of developing unhealthy attitudes to weight, body image and food, a group of Toronto researchers reported Tuesday. Their study of...
A.
had unhealthy attitudes to weight.
B.
were overweight.
C.
were on a diet.
D.
had healthy weights.
【单选题】吸氧过程中需要调节氧流量时，正确的做法是
A.
先关总开关，再调氧流量
B.
先关流量表，再调氧流量
C.
先拔出吸氧管，再调氧流量
D.
先拔出氧气连接管，再调氧流量
E.
先分离吸氧管与氧气连接管，再调氧流量