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【单选题】
以下對Bluetooth Low Energy (BLE)的Link層敘述，何者有誤？A.
若一個 BLE 週邊裝置是要讓其他裝置來讀取它所蒐集的資料時，則此裝置要輪流在 Advertising 專用頻道上發送 ADV_IND 訊框，以昭告它的存在。
B.
想要連線到感測器的 master 裝置，就在 Advertising 專用頻道上，發送 CONNECT_REQ 訊框給裝置
C.
當 slave 收到 CONNECT_REQ 框之，便停止 Advertising 的動作
D.
master 與 slave 在互傳資料時， slave 可以暫時進入 park state 暫停傳送資料，稍再重新與 master 建立連線。
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举一反三
【单选题】When is a contract concluded?
A.
The date of signing the contract.
B.
The time of reaching an disagreement.
C.
The arrival of an effective acceptance.
D.
The period of drafting the contract.
【单选题】Task 2 Choose the best answer to each of the following questions according to the passage. 1. When is a contract concluded?
A.
The date of signing the contract.
B.
The time of reaching an agreement.
C.
The arrival of an effective acceptance.
D.
The period of drafting the contract.
【单选题】According to CISG, when is an contract formed?
A.
when the contracting parties sign the contract.
B.
when the acceptance reachs the offeror.
C.
when the contract is approved by the government.
D.
when the offer reaches the offeree.
【简答题】数据库的安全性是指保护数据库以防止合法用户的()操作和非法用户的()操作。
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