电子轨道衡的主要技术指标有哪些？
参考答案：
电子轨道衡的主要技术指标有：计量范围和称重对象、计量精度、动态称重速度和测量过程。
肿瘤的命名既要反映肿瘤组织的来源，又要反映肿瘤的性质。其中，上皮组织发生的恶性肿瘤称为（）.
A.交界性肿瘤
B.肉瘤
C.癌
D.母细胞瘤
Although he is considered a great writer, __________. [ ]
A. his works are not widely read
B. but his woks are not widely read
C. however, his works are not widely read
D. still his works are widely read
