皮皮学，免费搜题
登录
搜题
【多选题】
天然色素根据化学结构可分为四吡咯衍生物类、二烯衍生物类、多酚类等。其中四吡咯衍生物类色素中重要的有 、 和A.
叶绿素
B.
血红素
C.
胆红素
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Early settlers_______ their survival _______ hard work and determination to succeed.
A.
corresponded; with
B.
owed ; to
C.
adapted; to
D.
attached; to
【多选题】根据政府采购法规规定，在政府采购活动中，关于保证金的规定错误的是：（）
A.
投标保证金不得超过采购项目预算金额的3%
B.
投标保证金只能以支票、本票或者担保机构出具的保函等非现金形式提交
C.
投标人未按照招标文件要求提交投标保证金的，投标无效。
D.
中标供应商的投标保证金应当自政府采购合同签订之日起5个工作日内退还
【单选题】Early settlers believe that a sunken body could be located by casting into a stream ______.
A.
any bandanna
B.
a bandanna that had been worn by a drowned man
C.
a magic bandanna
D.
a bandanna that had been blessed
【简答题】Both the early European settlers and the Aborigines had to______about natural products of Australia.
【单选题】In the early period, European settlers resorted to deceit and even war to deal with ______ who inhabited the American continent earlier than them.
A.
the Blacks
B.
the Indians
C.
the Mexicans
D.
the Spaniards
【判断题】The early settlers in the colony discovered a way to make money by growing tobacco. ()
A.
正确
B.
错误
相关题目：