包装秤称量的是（）内物料的质量。
A、成品料斗
B、细粉料斗
C、混合料斗
D、带式混合器
参考答案：D
某一重组DNA（6.2kb）的载体部分有两个SmaI酶切位点。用SmaI酶切后凝胶电泳上出现四条长度不同的带子，其长度总和与已知数据吻合，该重组分子插入片段上的SmaI酶切位点共有（）
A.4个
B.3个
C.2个
D.至少2个
An analyst does research about option moneyness. An investor paid $5 for a put option that was in-the-money $3. If the price of the underlying was $59 at the time the investor purchased the put option, the exercise price of that put option was closest to:
A. $51B. $56C. $62
