下列操作，不符合标准预防原则的是（）

A.医生接触冠心病患者的体液时戴手套

B.脱手套后立即洗手

C.护士的手有伤口，护理患者戴双层手套

D.用过的一次性针头套上针头套后放入锐器盒内

E.诊疗中可能发生患者体液飞溅到医生面部时，医生应戴口罩

The following information relates to the distribution of monthly returns from a diversified investment portfolio:

The distribution of monthly returns is best described as:()

A. positively skewed with a long tail on the left side.

B. negatively skewed with a long tail on the left side.

C. positively skewed with a tong tail on the right side.