[问答题] 简述色素细胞瘤。

荡桨时，采用方式（）旋回圈最小。 ["操满舵","满舵配合一舷桨向前，另一舷桨挡水","满舵配合一舷桨向前，另一舷桨向后"] 从ENIAC开始到今天，可以将电子计算机的发展分为（）代。 ["五","四","六","三"] 什么是药理学？ 经办员做完某批集体开户业务后，应有哪些单据做“开立卡/折/单报表”的附件（）。 ["集体开立个人账户申请书","员工身份证件复印件","集体开户确认书","代发业务协议书"] The changes in the channel’s sands and buoys on this coast are （） this chart can not be considered as a safe guide of the channel． ["frequent","so frequent","frequent that","so frequent that"] 简述色素细胞瘤。