在BASIC中，下旬表达式正确的是（ ）
A．SINX+X
B．SQRT(X)
C．X+3+SQR(R)
D．ABS│X-Y│
参考答案：C
To check for arterial insufficiency when a client is in a supine position, the nurse should elevate the extremity at a 45-degree angle and then have the client sit up. The nurse suspects arterial insufficiency if the assessment reveals which of the following（）
A. Elevational rubor.
B. No rubor for 10 seconds after the maneuver.
C. Dependent pallor.
D. A 30-second filling time for the veins.
最常见的椎管内神经源性肿瘤是（）
A.神经鞘瘤
B.神经纤维瘤
C.神经纤维肉瘤
D.神经节细胞瘤
E.神经节母细胞瘤
